(1) French chemist, Jacques Charles first studied variation of volume with temperature, in 1787.
(2) It states that, “The volume of a given mass of a gas is directly proportional to the absolute temperature (=°C+273) at constant pressure”.
Thus, V ∞ T at constant pressure and mass
or V=KT=K(t(°C) + 273.15), (where k is constant),
or (For two or more gases)
Thus, for every 1° change in temperature, the volume of a gas changes by 1/273.15 ≈ (1/273) of the volume at 0°C.