Charles' law (an aa kent as the law o volumes) is an experimental gas law that describes hou gases tend tae expand when heatit. A modren statement o Charles' law is:

An animation demonstratin the relationship atween volume an temperatur.

When the pressur on a sample o a dry gas is held constant, the Kelvin temperatur an the volume will be directly relatit.[1]

this directly proportional relationship can be written as:



V is the volume o the gas
T is the temperatur o the gas (meisurt in Kelvin).
k is a constant.


  1. Fullick, P. (1994), Physics, Heinemann, pp. 141–42, ISBN 0-435-57078-1.