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Charles' Law

A perfect gas and Charles' law

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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

or

V1/T1 = V2/T2

where

V = volume (m3, ft3...)

T = absolute temperature (K, R)

Example  Charles' Law

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

  V2 =  T2 V1/T1  

    = 373 K  2 litres / 273 K

    = 2.73 litres

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