Charles' Law

A perfect gas - volume and temperature

Charles' law states that in a perfect gas where the mass and pressure is kept constant, the volume vary directly with the absolute temperature.

Charles' Law can be expressed as

V / T = constant                                          (1)


V1 / T1 = V2 / T2                                         (1b)


V = volume (m3, ft3...)

T = absolute temperature (K, R)

Example - Charles' Law

charles' law

A gas occupies a volume of 2 liter at 0oC. The volume it occupies at 100oC can be calculated as

  V2 =  T2 V1 / T1  

    = (373 K)  (2 liters) / (273 K)

    = 2.73 (liters)

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