The law is known as Charle's law.
Charle's law:- Pressure remaining constant, the volume of a given mass of a gas increases or decreases by 1/273 of its volume at 0°C for every one degree centigrade rise or fall in temperature.
Mathematically.
Vt = V0 + {V0}/{273}t
= V0(1 + {t}/{273}) = V0({273 + t}/{273})
Where Vt is the volume of the gas at t°C and V0 is its volume at 0°C.
