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Charles's law
Relationship between volume and temperature of a gas at constant pressure / From Wikipedia, the free encyclopedia
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Charles' law (also known as the law of volumes) is an experimental gas law that describes how gases tend to expand when heated. A modern statement of Charles' law is:
When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion.[1]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e4/Charles_and_Gay-Lussac%27s_Law_animated.gif/320px-Charles_and_Gay-Lussac%27s_Law_animated.gif)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/62/Ideal_gas_law_relationships.svg/320px-Ideal_gas_law_relationships.svg.png)
This relationship of direct proportion can be written as:
So this means:
where:
- V is the volume of the gas,
- T is the temperature of the gas (measured in kelvins), and
- k is a non-zero constant.
This law describes how a gas expands as the temperature increases; conversely, a decrease in temperature will lead to a decrease in volume. For comparing the same substance under two different sets of conditions, the law can be written as:
The equation shows that, as absolute temperature increases, the volume of the gas also increases in proportion.