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From Wikipedia, the free encyclopedia

Room temperature is a common term to denote a certain temperature within enclosed space at which humans are accustomed. Room temperature is thus often indicated by general human comfort, with the common range of 20 °C (68 °F) to 25 °C (77 °F)[1], though climate may acclimatize people to higher or lower temperatures.

The term can also refer to a temperature of food to be consumed, which is placed in such a room for a given time.


Scientific use

For scientific calculations, room temperature is usually taken to be 20 to 25 degrees Celsius, or 293 to 298 kelvins (K), or 68 to 77 degrees Fahrenheit, with an average of about 24°C (70 °F). For numerical convenience, 300 K (27 °C, 80 °F) is often used. However, room temperature is not a precisely defined scientific term as opposed to Standard Temperature and Pressure, which has several, slightly different, definitions.

According to the American Society for Testing and Materials (ASTM), "Room temperature shall be considered to be 50 °F to 100 °F [10 to 38 °C] unless otherwise specified."

Ambient versus room temperature

"Room temperature" implies a temperature inside a building. "Ambient temperature" simply means "the temperature of the surroundings", and will be the same as room temperature indoors. In many languages, such as Spanish, there is an expression for "ambient temperature", but no distinct expression for "room temperature".

See also


  1. ^ American Heritage Dictionary of the English Language, 4th edition

Simple English

Room temperature does not have an exact scientific definition. It means a temperature that is normal in rooms used by human beings.


Human comfort and health

A comfortable room temperature depends on individual needs and other factors. According to the West Midlands Public Health Observatory (UK)[1], 21 °C (69.8 °F) is the recommended living room temperature, and 18 °C (64.4 °F) is a good bedroom temperature.

However, this might not be true for countries found near the equator. As the temperature is higher, the room temperature is around 30°C (86 °F).


For scientific work, room temperature is taken to be about 20 to 25 degrees Celsius with an average of 23°C (about 73.4 degrees Fahrenheit (°F), 528 to 537 degrees Rankine (°R), or 293 to 298 Kelvins (K)).[2] For numerical convenience, either 20 °C or 300 K is often used.

Condition for physical experiments

The progress and results of many scientific and industrial processes can sometimes depend on the temperature of the surroundings of the equipment. For example, a measurement of the charge of the electron does not depend upon the temperature of the test equipment. In this case, if scientists mention temperature at all, they usually only mention "room temperature", which means that what is being measured has not been cooled or heated.


  1. Why more people die in the winter, by Michelle Roberts, Health reporter, BBC News [1]
  2. The American Heritage® Dictionary of the English Language, Fourth Edition.


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