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# Charles' Law

## Volume of an ideal gas vs. 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)

or

V1 / T1 = V2 / T2                                         (1b)

where

V = volume (m3, ft3...)

T = absolute temperature (K, R)

### Example - 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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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

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