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Charles's 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's law is:

When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be directly related.[1]
This directly proportional relationship can be written as:
${\displaystyle V\propto T}$
or
${\displaystyle {\frac {V}{T}}=k,}$
where:
V is the volume of the gas,
T is the temperature of the gas (measured in kelvins),
k is a 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:
${\displaystyle {\frac {V_{1}}{T_{1}}}={\frac {V_{2}}{T_{2}}}\qquad {\text{or}}\qquad {\frac {V_{2}}{V_{1}}}={\frac {T_{2}}{T_{1}}}\qquad {\text{or}}\qquad V_{1}T_{2}=V_{2}T_{1}.}$
The equation shows that, as absolute temperature increases, the volume of the gas also increases in proportion.
Source: Wikipedia
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