Charles's Law states that at constant pressure, the volume of a gas is directly proportional to its absolute temperature. This means that as the temperature of a gas increases, its volume will also increase proportionally.

Mathematically:

V₁/T₁ = V₂/T₂

where:

* V₁ is the initial volume

* T₁ is the initial absolute temperature

* V₂ is the final volume

* T₂ is the final absolute temperature