Charle's Law

For a fixed mass of gas at constant pressure, the volume is directly proportional to the kelvin temperature.

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 Kelvin).

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:

An animation demonstrating the relationship between volume and temperature.