According to kinetic theory of gases, average kinetic energy of gas molecules is K=
3
2
RT i.e. K∝T We know that, kinetic energy may not be negative. Its minimum value may be equal to zero. Hence, minimum possible temperatureon the earth is equal to 0K at which molecular motion starts ceasing. ∴ Minimum possible temperature =0K=(0−273)∘C=−275∘C