Laboratory flasks are vessels (containers) which fall into the category of laboratory equipment known as glassware. In laboratory and other scientific settings, they are usually referred to simply as flasks. Flasks come in a number of shapes and a wide range of sizes, but a common distinguishing aspect in their shapes is a wider vessel "body" and one (or sometimes more) narrower tubular sections at the top called necks which have an opening at the top. Laboratory flask sizes are specified by the volume they can hold, typically in metric units such as milliliters (mL or ml) or liters (L or l). Laboratory flasks have traditionally been made of glass, but can also be made of plastic.
At the opening(s) at top of the neck of some glass flasks such as round-bottom flasks, retorts, or sometimes volumetric flasks, there are outer (or female) tapered (conical) ground glass joints. Some flasks, especially volumetric flasks, come with a stopper or cap for capping the opening at the top of the neck. Such stoppers can be made of glass or plastic. Glass stoppers typically have a matching tapered inner (or male) ground glass joint surface, but often only of stopper quality. Flasks which do not come with such stoppers or caps included may be capped with a rubber bung or cork stopper.
Flasks can be used for making solutions or for holding, containing, collecting, or sometimes volumetrically measuring chemicals, samples, solutions, etc. for chemical reactions or other processes such as mixing, heating, cooling, dissolving, precipitation, boiling (as in distillation), or analysis.
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There are several types of laboratory flasks, all of which have different functions within the laboratory. The most common types of flask are:
 Erlenmeyer flask or conical flask. |
 Round-bottom flask — a flask with a spherical body and one or more necks with ground glass joints. |
 Retort — a spherical vessel with a long downward-pointing neck. |
 Florence flask — a flask with a round body and one longer neck without a ground glass joint. |
 Büchner flask or sidearm flask — a thick-walled conical flask with a short hose-connection tube on the side of the neck. |
 Volumetric flask — for preparing liquids with volumes of high precision. It is a flask with an approximately pear-shaped body and a long neck with a circumferential fill line. |
 Dewar flask — a flask with a hollow space in the wall to hold a vacuum. |
Measure volume
Like many other common pieces of glassware, Erlenmeyer flasks could potentially be used in the production of illegal narcotics. In an effort to restrict such production, some U.S. states (including Texas) have begun requiring permits to purchase such glassware, including Erlenmeyer flasks, as well as chemicals identified as common starting materials. [1]
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Laboratory flasks are containers made of glass which are usually used in scientific laboratories. Flasks are made in different shapes and sizes. Their size are chosen by the volume they can hold, and is measured in metric units, like leters (L) or mililiters (mL). Their shape depends on what they are used for, but they usually consist of a body which contains the materials, and a neck which is they way to insert materials into the body. Some modern flasks are made of plastic.
There are many different types of laboratory flasks. They differ in their shape and what they are used for. Examples are:
Flasks can be used to make and hold solutions, to measure chemicals, and to contain chemical reactions like boiling, precipitation and analysis.
There are several types of laboratory flasks, all of which have different functions within the laboratory. The most common types of flask are:
Conical
Erlenmeyer flask or conical flask. |
Round-bottom flasks (stacked).PNG
Round-bottom flask — a flask with a round body and one or more necks with ground glass joints. |
My
Retort — a round vessel with a long downward-pointing neck. |
Round bottomed flask half
Florence flask — a flask with a round body and one longer neck without a ground glass joint. |
Buchner
Büchner flask or sidearm flask — a flask with thicl walls and a short tube for connection of a hose on the side of its neck. |
Volumetric
Volumetric flask — a flask used for preparing liquids in very precise volumes. It is a flask with a pear-shaped body and a long neck with a line on it which marks the standard volume it can contain. |
Dewar
Dewar flask — a flask with which is used to hold a vacuum. |
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