Charles's law (the law of volumes) is an experimental gas law that describes how gases tend to expand when heated.
the conclusion of Charles's Law that the volume of given mass changes with the changing of the temperature of the gas when pressure is kept constant.
Charles's Law can be used to compare varying conditions for a gas. Now The mathematical relationship of Charles's Law becomes: initial volume (V1) and temperature T1 while final volume (V2) and temperature (T2)
V1/T1 = V2/T2