From Wikipedia, the free encyclopedia
.^ The SI (International System of Units) [7] also promotes the use of this new binary prefixes. Use of prefixes in wget 2 February 2010 17:16 UTC www.mailarchive.com [Source type: FILTERED WITH BAYES]
^ Known as the International System of Units (abbreviated SI), the system is the basis for worldwide standardization of measurement units. IEEE Standards Description: si.102002 2 February 2010 17:16 UTC standards.ieee.org [Source type: Reference]
^ The conversion to a known system of units. Units in MathML 2 February 2010 17:16 UTC www.w3.org [Source type: Reference]
.^ Describe the names and abbreviations of the SI base units and the SI decimal prefixes . Units of measure 2 February 2010 17:16 UTC www.chem1.com [Source type: FILTERED WITH BAYES]
^ SI prefixes are used to form decimal multiples and submultiples of SI units. SI Prefixes : Measurement Units : Reference : National Physical Laboratory 2 February 2010 17:16 UTC www.npl.co.uk [Source type: Academic]
^ Metric and SI unit prefixes . Metric & SI units,metric prefix table 2 February 2010 17:16 UTC www.800mainstreet.com [Source type: Reference]
.^ Each prefix has a unique symbol that is prepended to the unit symbol. Whats the differences between RDA ,EAR & SI ?  Yahoo! UK & Ireland Answers 2 February 2010 17:16 UTC uk.answers.yahoo.com [Source type: General]
^ SI Prefixes List SI Prefixes List An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple. SI Prefixes List 2 February 2010 17:16 UTC www.unitarium.com [Source type: FILTERED WITH BAYES]
^ The size or quantity is indicated by the first letter or prefix symbol and the second letter or symbol identifies the base or derived unit .
.^ The SI system of units uses prefixes that indicate powers of ten.
^ The SI (International System of Units) [7] also promotes the use of this new binary prefixes. Use of prefixes in wget 2 February 2010 17:16 UTC www.mailarchive.com [Source type: FILTERED WITH BAYES]
^ Known as the International System of Units (abbreviated SI), the system is the basis for worldwide standardization of measurement units. IEEE Standards Description: si.102002 2 February 2010 17:16 UTC standards.ieee.org [Source type: Reference]
.^ SI prefixes quantity calculus . Christian Hill's website  physical chemistry tutorial  units and some basics: nonSI units 2 February 2010 17:16 UTC physchem.ox.ac.uk [Source type: Academic]
^ Zeros at the end of a number and before a decimal point may or may not be significant. Size and Scale  Made to Measure 2 February 2010 17:16 UTC invsee.asu.edu [Source type: FILTERED WITH BAYES]
^ SI prefixes are used to reduce the number of zeros shown in numerical quantities. Convert centi to zetta  SI System Prefixes Conversion 2 February 2010 17:16 UTC www.convertcenter.com [Source type: Academic]
 Convert kilo to zetta  SI System Prefixes Conversion 2 February 2010 17:16 UTC www.convertcenter.com [Source type: Academic]
For example, an electrical current of
0.000000001ampere, or onebillionth (
short scale) of an ampere, is written by using the SIprefix
nano as 1 nanoampere or 1 nA.
List of SI prefixes
The International System of Units specifies twenty SI prefixes:
SI prefixes
Prefix 
Symbol 
1000^{m} 
10^{n} 
Decimal 
Short scale 
Long scale 
Since^{[1]} 
yotta 
Y 
1000^{8} 
10^{24} 
1000000000000000000000000 
Septillion 
Quadrillion 
1991 
zetta 
Z 
1000^{7} 
10^{21} 
1000000000000000000000 
Sextillion 
Trilliard 
1991 
exa 
E 
1000^{6} 
10^{18} 
1000000000000000000 
Quintillion 
Trillion 
1975 
peta 
P 
1000^{5} 
10^{15} 
1000000000000000 
Quadrillion 
Billiard 
1975 
tera 
T 
1000^{4} 
10^{12} 
1000000000000 
Trillion 
Billion 
1960 
giga 
G 
1000^{3} 
10^{9} 
1000000000 
Billion 
Milliard 
1960 
mega 
M 
1000^{2} 
10^{6} 
1000000 
Million 
1960 
kilo 
k 
1000^{1} 
10^{3} 
1000 
Thousand 
1795 
hecto 
h 
1000^{2⁄3} 
10^{2} 
100 
Hundred 
1795 
deca 
da 
1000^{1⁄3} 
10^{1} 
10 
Ten 
1795 


1000^{0} 
10^{0} 
1 
One 

deci 
d 
1000^{−1⁄3} 
10^{−1} 
0.1 
Tenth 
1795 
centi 
c 
1000^{−2⁄3} 
10^{−2} 
0.01 
Hundredth 
1795 
milli 
m 
1000^{−1} 
10^{−3} 
0.001 
Thousandth 
1795 
micro 
µ 
1000^{−2} 
10^{−6} 
0.000001 
Millionth 
1960^{[2]} 
nano 
n 
1000^{−3} 
10^{−9} 
0.000000001 
Billionth 
Milliardth 
1960 
pico 
p 
1000^{−4} 
10^{−12} 
0.000000000001 
Trillionth 
Billionth 
1960 
femto 
f 
1000^{−5} 
10^{−15} 
0.000000000000001 
Quadrillionth 
Billiardth 
1964 
atto 
a 
1000^{−6} 
10^{−18} 
0.000000000000000001 
Quintillionth 
Trillionth 
1964 
zepto 
z 
1000^{−7} 
10^{−21} 
0.000000000000000000001 
Sextillionth 
Trilliardth 
1991 
yocto 
y 
1000^{−8} 
10^{−24} 
0.000000000000000000000001 
Septillionth 
Quadrillionth 
1991 
. 
Examples
 5 cm = 5×10^^{−2} m = 5×0.01 m = 0.05 m
 3 MW = 3×10^^{6} W = 3×1000000 W = 3000000 W
General use of prefix names and symbols
.^ SI Units can have a multiple or submultiple prefix.
^ Standard prefixes for the SI units of measure . SI (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Definitions of the SI units: The twenty SI prefixes. International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
.^ Remember, kilo equals one thousand, and mega equals one million. Lesson 6  Metric Prefixes 2 February 2010 17:16 UTC www.qsl.net [Source type: FILTERED WITH BAYES]
^ For example, the prefix kilo denotes a multiple of a thousand, so the kilo metre is 1 000 metres, the kilo gram 1 000 grams, and so on.
^ For example, the prefix kilo denotes a multiple of a thousand, so the kilo metre is 1000 metres, the kilo gram 1000 grams, and so on.
.^ Describe the names and abbreviations of the SI base units and the SI decimal prefixes . Units of measure 2 February 2010 17:16 UTC www.chem1.com [Source type: FILTERED WITH BAYES]
^ Writing unit symbols and names • 133 . The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
^ SI units with compound names . Bartlett's Guide to SI Units 2 February 2010 17:16 UTC www.abdn.ac.uk [Source type: Reference]
.^ Thus the prefix kilo could be used both for weight ( kilogram ) or length ( kilometre ) both indicating a thousand times the base unit. Metric system, SI  The metric system units and history 2 February 2010 17:16 UTC www.sciencemadesimple.com [Source type: Reference]
^ For technical documentation, the preferred way of writing SI prefixes and units is by their symbols; for example, 5 kg, not 5 kilogram, or five kilograms. Metric HowTo 2 February 2010 17:16 UTC www.astm.org [Source type: FILTERED WITH BAYES]
^ In contrast to unit symbols, the spelling and grammar for unit names are specific to a given language and are not part of the SI (for example, the spellings kilogram and ampere are used in English, while kilogramme and ampère are used in French, but kg and A are the universal SI symbols). Physics Today August 2004 Guide for Metric Practice 2 February 2010 17:16 UTC www.aip.org [Source type: Academic]
.^ Internationally recognized conventions have been established for standard usage of SI units. Physics Today August 2004 Guide for Metric Practice 2 February 2010 17:16 UTC www.aip.org [Source type: Academic]
^ A prefix may be added to a unit to produce a multiple of the original unit. SI (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Examples of SI derived units . Physics Today August 2004 Guide for Metric Practice 2 February 2010 17:16 UTC www.aip.org [Source type: Academic]
.^ String getShortName () The preferred short name (prefix) as indicated in the TLD. This may be used by authoring tools as the preferred prefix to use when creating an taglib directive for this library. TagLibraryInfo (JavaServer Pages API Documentation) 2 February 2010 17:16 UTC www.access.si [Source type: General]
^ Note 1: Using prefix maps may not find the desired prefix as many maps only show primary prefixes. Amateur Radio Prefixes 2 February 2010 17:16 UTC www.ac6v.com [Source type: Reference]
^ Some other nouns may be used as prefixes, especially in nouns or in single lexical items. Old Skourene 2 February 2010 17:16 UTC zompist.com [Source type: FILTERED WITH BAYES]
.^ Describe the names and abbreviations of the SI base units and the SI decimal prefixes . Units of measure 2 February 2010 17:16 UTC www.chem1.com [Source type: FILTERED WITH BAYES]
^ Expression in terms of SI base units . Int'l System of Units 2 February 2010 17:16 UTC www.sas.org [Source type: Reference]
 PowerPedia:International System of Units  PESWiki 2 February 2010 17:16 UTC www.peswiki.com [Source type: Reference]
^ Note that the kilogram is the only base unit with a prefix . PowerPedia:International System of Units  PESWiki 2 February 2010 17:16 UTC www.peswiki.com [Source type: Reference]
.^ Also i want to extend my previous example because we must use ini_get('arg_separator.output') instead of '&' separator! PHP: http_build_query  Manual 2 February 2010 17:16 UTC www.php.net [Source type: FILTERED WITH BAYES]
^ Maybe you could use EXTR_PREFIX_ALL instead of EXTR_OVERWRITE, for example. PHP: extract  Manual 2 February 2010 17:16 UTC www.php.net [Source type: FILTERED WITH BAYES]
Prefixes corresponding to an
exponent that is divisible by three are often recommended.
.^ The system used the multiplier 1024 (2 10 ), rather than 1000 (10 3 ) as in the SI system, to arrive at successively larger prefixes. Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ It has also been adopted by computer scientists in the kilobyte (kB); this, however, is often used to mean 2 10 , or 1,024 bytes 1 , rather than 1,000. http://www.bbc.co.uk/dna/h2g2/A29779159 2 February 2010 17:16 UTC www.bbc.co.uk [Source type: FILTERED WITH BAYES]
.^ Many SI prefixes, and the very idea of using prefixes for this purpose, predate the introduction of the SI in 1960, so they are also quite properly used with many nonSI units. Keiger Printing  Glossary of Terms 2 February 2010 17:16 UTC www.keiger.com [Source type: General]
^ However, these prefixes have decimal meanings in other contexts, e.g., when used with SI units . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ To avoid possible misinterpretation when more than one unit appears in the denominator, the preferred practice is to use parentheses or negative exponents (for example, W/(m 2 ·K 4 ) or W·m −2 ·K −4 ). Physics Today August 2004 Guide for Metric Practice 2 February 2010 17:16 UTC www.aip.org [Source type: Academic]
SI prefixes with symbols for time and angles
.^ The binary definition of the prefixes k, M, G etc is not permitted by the United States National Institute of Standards and Technology (NIST). Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Bureau International des Poids et Mesures (2006). SI (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
 International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
^ The Bureau International des Poids et Mesures (BIPM) was set up in 1875 with the principal aim of establishing and publishing standards of physical measurement. Notes on Measures  Prefixes 2 February 2010 17:16 UTC www.cleavebooks.co.uk [Source type: FILTERED WITH BAYES]
.^ Describe the names and abbreviations of the SI base units and the SI decimal prefixes . Units of measure 2 February 2010 17:16 UTC www.chem1.com [Source type: FILTERED WITH BAYES]
^ A controversy has developed concerning GSA publication conventions on the use of time units. Geological Society of America  Policy 2 February 2010 17:16 UTC www.geosociety.org [Source type: FILTERED WITH BAYES]
^ The binary definition of the prefixes k, M, G etc is not permitted by the United States National Institute of Standards and Technology (NIST). Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^{[2]} The BIPM’s position on the use of SI prefixes with units of time larger than the second is the same as that of the NIST but their position with regard to angles differs: they state "However astronomers use milliarcsecond, which they denote mas, and microarcsecond, µas, which they use as units for measuring very small angles."
^{[3]}
SI prefixes for temperature in °C
Official policy also varies from common practice for the degree Celsius (°C). NIST
states; "Prefix symbols may be used with the unit symbol °C and prefixes may be used with the unit name 'degree Celsius'. For example, 12 m°C (12 millidegrees Celsius) is acceptable." However the use of prefixed forms of "°C" (such as "µ°C") has not been adopted in science and engineering; prefixed forms of the
kelvin are usually used instead.
Exponentiation of symbols
.^ Included are factors (usually 10 3 to 10 3 ) of the meter, the liter, and the gram which cannot be formed simply by attaching prefixes to these 3 units.
^ Symbols for derived units formed from multiple units by multiplication are joined with a space or centre dot (·), for example "N m" or "N·m". SI (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Multiples and submultiples of metric units are related by powers of ten; the names for these are formed with prefixes. Metric system, SI  The metric system units and history 2 February 2010 17:16 UTC www.sciencemadesimple.com [Source type: Reference]
Pronunciation
.^ "Giga" is an internationally and interdisciplinarily accepted standard prefix that means "multiplied by 10^9". DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
.^ The IEEE (Institution of Electrical and Electronics Engineers), IEEE Computer Society, ISO (International Standards Organisation) and IEC (International Electrotechnical Commission) have begun work jointly on defining standards and conventions for prefixes that are multiples of 2 not 10. A concise reference to the Metric System (SI) 2 February 2010 17:16 UTC www.pyxidium.unet.com [Source type: Reference]
^ To eliminate this imprecision and confusion, a set of prefixes for binary multiples that closely parallel those for powers of 10 has been adopted as a standard by the International Electrotechnical Commission ( IEC ). Prefixes for binary multiples 2 February 2010 17:16 UTC cnx.org [Source type: General]
^ Ned noted that one of the SI proposals is for the prefix "luma" , representing 10 63 . Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
This suggests a hard German
g was originally intended as the pronunciation. Self was unable to ascertain at what point the
/dʒ/ (soft
g) pronunciation became accepted, but as of 1995 current practice had returned to
/ɡ/ (hard
g).
^{[4]} ^{[5]}
.^ Spell with spelling rules and associations and by learning root words with prefixes and suffixes. Tag: Prefixes  Explore content tagged Prefixes on eHow.com 2 February 2010 17:16 UTC www.ehow.com [Source type: FILTERED WITH BAYES]
^ Now, Seagate can claim that it's the HDD industry standard to use SI prefixes instead of IT (information technology) prefixes (even if the prefixes use the same word, they are different values! DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ It uses the allomorph – ah of the causative prefix, which is the allomorph typically used for roots which begin with nonlow vowels. Reanalysis of Passive and Negative Prefixes in Seri 2 February 2010 17:16 UTC journals.dartmouth.edu [Source type: FILTERED WITH BAYES]
.^ The former seems to be more common in Britain (short stress on the first syllable) and may have the slight advantage of being consistent with the English pronunciation of kilogram and kilohertz. Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
^ It is suggested that in English, the first syllable of the name of the binarymultiple prefix should be pronounced in the same way as the first syllable of the name of the corresponding SI prefix, and that the second syllable should be pronounced as "bee." Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ (The sentence, "I live with her," for example, is stressed the same way as I pronounce "kilometer". xkcd • View topic  Colloquial SI units 2 February 2010 17:16 UTC forums.xkcd.com [Source type: FILTERED WITH BAYES]
.^ SI has nothing to do with anything; it's just using the same word but different definition which is a common phenomenon in language and science. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ May2005 03:59 The following is a neat use for extract to store and manipulate large amounts of form data from. PHP: extract  Manual 2 February 2010 17:16 UTC www.php.net [Source type: FILTERED WITH BAYES]
^ The word coherent is used here in the following sense: when coherent units are used, equations between the numerical values of quantities take exactly the same form as the equations between the quantities themselves. The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
For example,
kilometre is commonly pronounced
/kɨˈlɒmɨtər/, with
reduced vowels on both syllables of
metre.
Other and obsolete prefixes
.^ These principles still underpin the modern metric system (SI). A concise reference to the Metric System (SI) 2 February 2010 17:16 UTC www.pyxidium.unet.com [Source type: Reference]
^ They are the creators > and maintainers of the SI system.
^ Of course the CGPM "recognizes" SI as a system  they created the > SI system.
.^ But nonSI unit systems are in such disarray that using them for interchange is not practical. Representation of numerical values and SI units in character strings for information interchanges 2 February 2010 17:16 UTC people.csail.mit.edu [Source type: Reference]
^ NonSI units accepted for use with SI .
^ The most commonly used prefix is in color. Amateur Radio Prefixes 2 February 2010 17:16 UTC www.ac6v.com [Source type: Reference]
In most contexts only a few, the most common, standard combination are established:
 Mass: hectogram, gram, milligram, microgram, and smaller are common. .^ However, for arrays whose elements are larger than four bytes, you can use the movs instruction to initialize the entire array to the content of the first element.
 Art of Assembly: Chapter Fifteen2 2 February 2010 17:16 UTC ipoint.vlsi.uiuc.edu [Source type: Reference]
^ A very useful reference not only on the correct use of SI units, but on international standard conventions for mathematical and scientific notation in general is: ISO Standards Handbook: Quantities and units. Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
.
 Volume in litres: litre, decilitre, centilitre, millilitre, microlitre, and smaller are common.^ During the history of the metric system a number of variations have evolved and their use spread around the world replacing many traditional measurement systems.
^ The history of the metric system has seen a number of variations, whose use has spread around the world, to replace many traditional measurement systems. International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
^ Bar tenders in many countries use centilitres (cL) or decilitres (dL) and have measuring spoons for these. Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
.^ For example, kilo denotes a multiple of a thousand and milli denotes a multiple of a thousandth hence there are one thousand millimetres to the metre and one thousand metres to the kilometre. International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
^ The official unit of volume in the SI is the cubic metre. A concise reference to the Metric System (SI) 2 February 2010 17:16 UTC www.pyxidium.unet.com [Source type: Reference]
.
 Length: kilometre, metre, decimetre, centimetre, millimetre, and smaller are common.^ METRE The base unit for length quantities ( m ).
 SI 2 February 2010 17:16 UTC jscience.org [Source type: Reference]
^ For example, kilo denotes a multiple of a thousand and milli denotes a multiple of a thousandth hence there are one thousand millimetres to the metre and one thousand metres to the kilometre. International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
^ The yard or the metre shall be the unit of measurement of length and the pound or the kilogram shall be the unit of measurement of mass by reference to which any measurement involving a measurement of length or mass shall be made [... DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
.^ Since most nonSI units in common use, such as the US customary units, are nowadays defined in terms of SI units, any change in the definition of the SI units results in a change of the definition of the older units, as well. International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
^ The micrometre, μm, is commonly used in precision engineering, and is sometimes referred to as a micron. http://www.bbc.co.uk/dna/h2g2/A29779159 2 February 2010 17:16 UTC www.bbc.co.uk [Source type: FILTERED WITH BAYES]
^ The International System of Units, the SI, is a system of units, adopted by the CGPM, which provides the internationally agreed reference in terms of which all other units are now defined. The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
.^ Currency may also be taken to be a base dimension in some fields such as economics. Units in MathML 2 February 2010 17:16 UTC www.w3.org [Source type: Reference]
^ Atomic scale units used in physics and chemistry, such as the ångström, electronvolt, atomic mass unit , and barn. International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
.^ Will: Modems always were wierd; mainly becaue they (usually) used 10 bit bytes. Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
.^ Greek names were used for the integral (largescale) multipliers, and Latin for the fractional (smallscale) ones. http://www.bbc.co.uk/dna/h2g2/A29779159 2 February 2010 17:16 UTC www.bbc.co.uk [Source type: FILTERED WITH BAYES]
^ The Celsius temperature scale; kelvins are rarely employed in everyday use. SI (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
 International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
^ At small scales the basic unit is the gram (or fractions thereof), but for larger orders fractions of ounces and pounds are used generally starting at ⅛ ounce, which is often defined in turn as 3.5 grams. xkcd • View topic  Colloquial SI units 2 February 2010 17:16 UTC forums.xkcd.com [Source type: FILTERED WITH BAYES]
.
 Time: second, millisecond, microsecond, and shorter are common.^ As of 2000, the units bit and byte have not been accepted for use with SI, but are in widespread use.
 Representation of numerical values and SI units in character strings for information interchanges 2 February 2010 17:16 UTC people.csail.mit.edu [Source type: Reference]
^ NonSI units accepted for use with SI . Metric System of Measurement  SI 2 February 2010 17:16 UTC www.edinformatics.com [Source type: Reference]
^ Units that are used with the SI . A concise reference to the Metric System (SI) 2 February 2010 17:16 UTC www.pyxidium.unet.com [Source type: Reference]
The kilosecond and megasecond also have some use, though for these and longer times one usually uses either scientific notation or minutes, hours, and so on.
.^ Formatting the value of a quantity The numerical value always precedes the unit, and a space is always used to separate the unit from the number. The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
^ Each cache always stores the drive and "parent" sector (the ;** first sector of the directory containing the entry) and the ;** short and long names.
^ The directory cache also stores the ;** first sector of the directory, whilst the name cache stores the ;** sector and offset of the directory entries (short & long).
.^ Since the measurement of a meter is now defined in absolute physical terms that has nothing whatever to do with the absolute value of a "meter" then you can also standardize a foot as multiples of that same base measure. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ When writing dimensionless quantities, the terms 'ppb' (parts per billion) and 'ppt' (parts per trillion) are recognised as languagedependent terms since the value of billion and trillion can vary from language to language. International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
^ The Russian example is interesting, but highlights the difference between the two languages more than anything. xkcd • View topic  Colloquial SI units 2 February 2010 17:16 UTC forums.xkcd.com [Source type: FILTERED WITH BAYES]
.^ SI prefix in binary use . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ My point is that using SI prefixes to determine values that are not SI standards is where confusion arises. DailyTech  Nanochip Promises 100GBperchip Alternative to Flash Memory 2 February 2010 17:16 UTC www.dailytech.com [Source type: General]
^ Blanka on March 25, 2008 3:50 PM "they intentionally use the official SI definitions of the Giga prefix so they can inflate the the sizes of their hard drives" . Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
NonSI units
 The use of prefixes can be traced back to the introduction of the metric system in the 1790s, long before the SI was introduced in 1960. The prefixes, including those introduced after the introduction of the SI, are used with any metric units, whether officially included in the SI or not (e.g., millidynes).
 SI prefixes rarely appear with imperial units or English units except in some special cases (e.g., microinches, kilofeet, kilopound or 'kip').
 They are also used with other specialized units used in particular fields (e.g., megaelectronvolts, gigaparsecs).
 They are also occasionally used with currency units (e.g., gigadollar), mainly by people who are familiar with the prefixes from scientific usage.
Similar prefixes as abbreviations
.^ Derived units are the units which may be expressed in terms of base units and supplementary units by means of algebra (using the mathematical symbols of multiplication and division). International System of Units (SI)  KEYENCE Corporation 2 February 2010 17:16 UTC www.sensorcentral.com [Source type: Reference]
^ Unit symbols formed from other unit symbols by multiplication are indicated by means of a dot (PERIOD, " . Representation of numerical values and SI units in character strings for information interchanges 2 February 2010 17:16 UTC people.csail.mit.edu [Source type: Reference]
^ However, these prefixes have decimal meanings in other contexts, e.g., when used with SI units . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
.^ The qualifications would be that deque lacks some features that list has, and that the shiftbyone operation is actually a call to memmove () and may not apply to all implementations. list.pop(0) vs. collections.dequeue  comp.lang.python  Google Gruppi 2 February 2010 17:16 UTC groups.google.it [Source type: FILTERED WITH BAYES]
^ The problem with reversing the lists is that it gets sliced and diced and passed around to other methods, one of which, html_block_tag, recursively calls back to the main method. list.pop(0) vs. collections.dequeue  comp.lang.python  Google Gruppi 2 February 2010 17:16 UTC groups.google.it [Source type: FILTERED WITH BAYES]
^ Here's a nice example, conveniently titled 40 000 km . xkcd • View topic  Colloquial SI units 2 February 2010 17:16 UTC forums.xkcd.com [Source type: FILTERED WITH BAYES]
.^ Although these prefixes are not part of the SI, they should be used in the field of information technology to avoid the incorrect usage of the SI prefixes. PHP Bugs: #46534: Incorrect usage of SIprefixes by PHP 2 February 2010 17:16 UTC bonsai.php.net [Source type: Reference]
^ (I’ve used the durative 3s form for these to emphasize the commonality; but they must agree with their subject in case and person. Old Skourene 2 February 2010 17:16 UTC zompist.com [Source type: FILTERED WITH BAYES]
^ Its symbol is the lowercase h, but the uppercase H was used before 1960. http://www.bbc.co.uk/dna/h2g2/A29779159 2 February 2010 17:16 UTC www.bbc.co.uk [Source type: FILTERED WITH BAYES]
.^ However, these prefixes have decimal meanings in other contexts, e.g., when used with SI units . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Donald Morrison proposed to use the Greek letter κ to denote 1024, κ² to denote 1024×1024, and so on. Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Quantities that are multiples of the unit by a power of 2 are indicated using similarlyvalued SI prefixes, such as using kilo (the SI prefix for 1000) to indicate 2 10 =1024. Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
.^ By precalcuting one of these domain names and registering it, the gang behind Conficker could take over any or all of the millions of computers they had infected. Black Hat ® Technical Security Conference: USA 2009 // Briefings 2 February 2010 17:16 UTC blackhat.com [Source type: FILTERED WITH BAYES]
.^ The term billion should be avoided since in most countries outside the USA (including the UK) it means a millionmillion (prefix tera), whereas in the USA it means a thousand million (prefix giga). A concise reference to the Metric System (SI) 2 February 2010 17:16 UTC www.pyxidium.unet.com [Source type: Reference]
^ I've often run applications with millions of lists > I bet even in your application, the amount of memory consumed by the > PyListObjects themselves is greatly dwarfed by other objects, notably > the list elements themselves Such lists often would just one element or even be empty. list.pop(0) vs. collections.dequeue  comp.lang.python  Google Gruppi 2 February 2010 17:16 UTC groups.google.it [Source type: FILTERED WITH BAYES]
^ Regarding points #2 and #4, > the tutorial is at least not overly technical or specific; it just > explains the requirement to shift other elements one by one in simple > layman's terms. list.pop(0) vs. collections.dequeue  comp.lang.python  Google Gruppi 2 February 2010 17:16 UTC groups.google.it [Source type: FILTERED WITH BAYES]
Units used in computing and telecommunications
.^ The allocated storage is File System defined. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ But Bytes and bits are not SI units. DailyTech  Nanochip Promises 100GBperchip Alternative to Flash Memory 2 February 2010 17:16 UTC www.dailytech.com [Source type: General]
^ BIT The unit for binary information ( bit ). SI 2 February 2010 17:16 UTC jscience.org [Source type: Reference]
 SI (JSR275 0.9.2SNAPSHOT API) 2 February 2010 17:16 UTC jsr275.kenai.com [Source type: Reference]
.^ SI prefixes and symbols for multiples and submultiples. Recommendations concerning Units (SI Units)  IAU 2 February 2010 17:16 UTC www.iau.org [Source type: Reference]
^ SI prefix in binary use . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ EVERYBODY IN THE WHOLE WORLD thinks that the SI prefixes mean powers of 2, and there is SO much history behind this usage  literally DOZENS of years! Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
.^ What are the official short symbols for bit and byte? Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
^ In fact, in UNIX (as anywhere else in the IT world), the term "octet" by itself usually refers to bit octets, also known as 8bit characters, or 8bit bytes. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ It is generally accepted that a single binary measure of information, the bit, is described symbolically by a small "b", and the byte consisting of 8 bits as capital "B". A concise reference to the Metric System (SI) 2 February 2010 17:16 UTC www.pyxidium.unet.com [Source type: Reference]
.^ As used in this document, the terms kilobyte (kB) means 2 10 or 1024 bytes, megabyte (MB) means 1024 kilobytes, and gigabyte (GB) means 1024 megabytes." Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ There are no SI units for computer storage capacity but the decimal prefix meanings of KB, MB, and GB are often referred to as SI prefixes. Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Secs may sometimes be seen instead of s or seconds . SI (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
.^ The binary definition of the prefixes k, M, G etc is not permitted by the United States National Institute of Standards and Technology (NIST). Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ As of 2000, the units bit and byte have not been accepted for use with SI, but are in widespread use. Representation of numerical values and SI units in character strings for information interchanges 2 February 2010 17:16 UTC people.csail.mit.edu [Source type: Reference]
^ But Bytes and bits are not SI units. DailyTech  Nanochip Promises 100GBperchip Alternative to Flash Memory 2 February 2010 17:16 UTC www.dailytech.com [Source type: General]
^{[9]}
In nonstandard use,
K is often used as a symbol prefix to the units
bit and
byte to designate the
binary prefix kibi = 2
^{10} = 1024.
Binary prefixes
Main article:
Binary prefix
.^ Prefix tera giga mega kilo hecto deca . The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
^ Kilo, Mega, Giga etc. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ As of 2000, the units bit and byte have not been accepted for use with SI, but are in widespread use. Representation of numerical values and SI units in character strings for information interchanges 2 February 2010 17:16 UTC people.csail.mit.edu [Source type: Reference]
.^ The IEC introduced prefixes to represent binary multiples of units. Units in MathML 2 February 2010 17:16 UTC www.w3.org [Source type: Reference]
^ As of 2000, the units bit and byte have not been accepted for use with SI, but are in widespread use. Representation of numerical values and SI units in character strings for information interchanges 2 February 2010 17:16 UTC people.csail.mit.edu [Source type: Reference]
^ Does kilo mean 1024 in computing? Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
.^ As the binary multipliers 1024 (2 10 ), 1 048 576 (2 20 ), etc., are close in value to certain SI prefixes such as kilo (1000 = 10 3 ) and mega ( 1 000 000 = 10 6 ), respectively, it has been common practice amongst computer professionals to use these prefixes for the binary multiples – for example, to use the symbol "M" ("mega") to mean 1 048 576 instead of 1 000 000 . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ M : mega  : megal  : [SI prefix; Gk] large; a million, 106, 1,000,000. Numbers/Prefixes/Suffixes 2 February 2010 17:16 UTC www.arapacana.com [Source type: FILTERED WITH BAYES]
.^ Hard Disk Drives are computer memory. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ Hard drives from all manufacturers use 1 GB = 1 billion bytes. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ Yes, and the bytes in a 80,000,000 "80GB" hard drive are binary bytes. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
.^ The harmonized ISO / IEC IEC 8000013:2008 standard cancels and replaces subclauses 3.8 and 3.9 of IEC 600272:2005 (those defining Prefixes for binary multiples). Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ International Electrotechnical Commission (20050815). Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ The IEC introduced binary prefixes in 1998 to correct the confusion resulting from this. Units in MathML 2 February 2010 17:16 UTC www.w3.org [Source type: Reference]
.^ Understand what a prefix is, it is to describe the suffix which is a binary not decimal value. DailyTech  Nanochip Promises 100GBperchip Alternative to Flash Memory 2 February 2010 17:16 UTC www.dailytech.com [Source type: General]
^ It doesn't make any sense to arrange bytes in decimal values because they are themselves a binary representation, 2^3 bits. Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
^ Only ignorant people who can't understand that there is more than one number system think that a prefix can only exist in the decimal system or has to have a decimal value, that it couldn't be a binary value. DailyTech  Nanochip Promises 100GBperchip Alternative to Flash Memory 2 February 2010 17:16 UTC www.dailytech.com [Source type: General]
The symbols are the decimal symbol, always capitalized, followed by the letter 'i'.
.^ However, it's absolutely false that, according to SI, a kilobyte is 1000 bytes. Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
^ Within the field of computer science, one kilobyte = 1024 bytes. Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
^ Therefore it became convenient to have, e.g., KB = 1024 bytes instead of 1000 bytes. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
.^ It now defines new unit prefixes for powers of two: 1024 = 2^10 = 1 024 kibi Ki 1024^2 = 2^20 = 1 048 576 mebi Mi 1024^3 = 2^30 = 1 073 741 824 gibi Gi 1024^4 = 2^40 = 1 099 511 627 776 tebi Ti 1024^5 = 2^50 = 1 125 899 906 842 624 pebi Pi 1024^6 = 2^60 = 1 152 921 504 606 846 976 exbi Ei This way, the 90 mm floppy disk has now unambiguously a capacity of 1400 kibibytes (KiB). Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
^ In the BINARY system of notation K=2^10, M=2^20, G=3^30, T=2^40, P=2^50. DailyTech  A Download for Your Troubles: Seagate Hard Drive Settlement Now Online 2 February 2010 17:16 UTC www.dailytech.com [Source type: FILTERED WITH BAYES]
^ In electrical engineering, a jiffy used to be the period of the electrical power grid, namely: 20 ms in Europe (50 Hz) or about 16.6667 ms in the US (60 Hz). Measurements, Units of Measurement, Weights and Measures  Numericana 2 February 2010 17:16 UTC home.att.net [Source type: FILTERED WITH BAYES]
.^ Traditional prefixes in binary use . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ SI prefix in binary use . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Standard dictionaries do recognize the binary use of these prefixes. Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
Proposed changes
There are proposals for further harmonisation of the capitalisation.
.^ Original Metric Prefixes (1793): kilo, hecto, deca, (unity), deci, centi, milli] . Humor and Science  Numericana 2 February 2010 17:16 UTC home.att.net [Source type: FILTERED WITH BAYES]
^ For example, "kilo", "hecto" and "deca" are used in various countries for 1 kg, 100 g and 10 g when buying groceries. Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
.^ With the exception of da (deca), h (hecto), and k (kilo), all multiple prefix symbols are capital (upper case) letters, and all submultiple prefix symbols are lower case letters. The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
^ Because SI prefix symbols can neither be attached to the symbol 1 nor to the name “one”, powers of 10 are used to express the values of particularly large or small dimensionless quantities. The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
^ Prefix tera giga mega kilo hecto deca . The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
The
CGPM has postponed its decision on both matters for now.
.^ Further letters in a unit or prefix are always lowercase. Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
^ This also applies to other largerscale prefixes such as gigabytes and terabytes. http://www.bbc.co.uk/dna/h2g2/A29779159 2 February 2010 17:16 UTC www.bbc.co.uk [Source type: FILTERED WITH BAYES]
^ However, these prefixes have decimal meanings in other contexts, e.g., when used with SI units . Binary prefixes (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
This eventually led to the introduction of special units for area and volume without exponents in the original
metric system:
 1 are (a) = 100 m^{2} (10 m × 10 m = 1 dam × 1 dam = 1 dam^{2})
 ⇒ 1 ca = 1 m^{2} (1 m × 1 m)
 ⇒ 1 ha = 10 000 m^{2} (100 m × 100 m = 1 hm × 1 hm = 1 hm^{2})
 1 stere (st) = 1 m^{3}
 1 litre (l or L) = 1 dm^{3} = 1 mst = 0.001 m^{3}
.^ It also contains the hectare, the litre, and the tonne, which are all in common everyday use throughout the world, and which differ from the corresponding coherent SI unit by an integer power of ten. The International System of Units (SI) 2 February 2010 17:16 UTC www.scribd.com [Source type: Reference]
.^ Symbols are written in upright Roman type (m for metres, l for litres), so as to differentiate from the italic type used for mathematical variables ( m for mass, l for length). International System of Units: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries. 2 February 2010 17:16 UTC www.chemie.de [Source type: Reference]
^ Symbols are written in upright ( Roman ) type (m for metres, l for litres), so as to differentiate from the italic type used for variables ( m for mass, l for length). SI (Linux Reviews) 2 February 2010 17:16 UTC linuxreviews.org [Source type: Reference]
^ Also back home liquids are usually done in decilitres and solids in decagrams, so we call them "deci" and "deka" respectively. xkcd • View topic  Colloquial SI units 2 February 2010 17:16 UTC forums.xkcd.com [Source type: FILTERED WITH BAYES]
.^ Although the introduction of the metric system is clearly slowest in the US, compared to any other developed country, it is widely used today in the US in selected areas. Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
^ What inchbased standards are widely used in metric countries? Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
^ Users of the metric system, on the other hand, have to use conversion factors only where there are significant physical reasons for using alternative units to express some situation. Metric System FAQ 2 February 2010 17:16 UTC www.faqs.org [Source type: Reference]
.^ There was a legitimate need to compare bandwidth with storage (the Internet), but it also did not make sense to use powers of 2 because bandwidth was actually provided in powers of 10 (bits). Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
^ Or to make it so that kilo always, always, always means 10^3, and create the new prefix to always mean 2^10? Coding Horror: Gigabyte: Decimal vs. Binary 2 February 2010 17:16 UTC www.codinghorror.com [Source type: FILTERED WITH BAYES]
^ Funny Prefixes There are no official metric prefixes above 10 24 or below 10  24 . Humor and Science  Numericana 2 February 2010 17:16 UTC home.att.net [Source type: FILTERED WITH BAYES]
.^ The average distance from the Earth to the Sun is actually a bit larger than that (by a relative amount very nearly equal to a third of the EarthSun mass ratio). Measurements, Units of Measurement, Weights and Measures  Numericana 2 February 2010 17:16 UTC home.att.net [Source type: FILTERED WITH BAYES]
See also
References
External links