Charles' Law states

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Charles' Law states

Charles' Law shows that, at constant pressure, a gas’ volume changes directly with its absolute temperature. Since temperature must be on an absolute scale to compare proportional changes, we use Kelvin. This gives the clear relation that the volume divided by temperature stays constant as the gas changes state: V1/T1 = V2/T2. If the Kelvin temperature doubles while pressure remains the same, the volume doubles too. For example, 1 L at 273 K would become about 2 L at 546 K. Celsius values won’t work directly because Celsius isn’t absolute; you must convert to Kelvin first. The direct V/T ratio is the simplest way to express the proportional relationship; other algebraic forms are rearrangements of the same idea, but the V1/T1 = V2/T2 form explicitly captures the proportionality.

Charles' Law shows that, at constant pressure, a gas’ volume changes directly with its absolute temperature. Since temperature must be on an absolute scale to compare proportional changes, we use Kelvin. This gives the clear relation that the volume divided by temperature stays constant as the gas changes state: V1/T1 = V2/T2. If the Kelvin temperature doubles while pressure remains the same, the volume doubles too. For example, 1 L at 273 K would become about 2 L at 546 K. Celsius values won’t work directly because Celsius isn’t absolute; you must convert to Kelvin first. The direct V/T ratio is the simplest way to express the proportional relationship; other algebraic forms are rearrangements of the same idea, but the V1/T1 = V2/T2 form explicitly captures the proportionality.

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