The volume of a fixed mass of gas at a constant pressure expand by the constant fraction of its volume at 0 °C. For each Celsius or kelvin degree its temperature is raised. For any ideal gas fraction it is approximately 1/273. This can be expressed by the equation

were *V*° is the volume at 0°C and *V* is its volume at *t*°C.

This is equivalent to the statement that the volume of a fixed mass of gas at a constant pressure is proportional to its thermodynamic temperature

This law also know as Gay-Lussac’s law.

An equation similar to the one given above applies to pressures for ideal gases:

Generalic, Eni. "Charles’ law." *Croatian-English Chemistry Dictionary & Glossary*. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.

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