# Charles' Law

## A perfect gas - volume and temperature

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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 (1)

or

V_{1 }/ T_{1}= V_{2}/ T_{2}(1b)_{}

where

V = volume (m^{3}, ft^{3}...)

T = absolute temperature (K, R)

### Example - Charles' Law

A gas occupies a volume of *2 liter* at *0 ^{o}C*. The volume it occupies at

*100*can be calculated as

^{o}C

V_{2 }= T_{2 }V_{1 }/ T_{1}_{ }

= (373 K) (2 liters) / (273 K)

= 2.73 (liters)

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