# Charles's law

**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:

This directly proportional relationship can be written as:

or

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:

The equation shows that, as absolute temperature increases, the volume of the gas also increases in proportion.

Source: Wikipedia

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