Question

what does the third law of thermodynamics states?

Answer 1

The Third Law states, “The entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 K).”

Answer 2

The third law of thermodynamics states that the entropy of a perfectly crystalline substance approaches zero as the absolute zero of temperature is reached.

At lower temperature, the energy of the molecules would be less. Hence the translational, rotational and vibrational motion of the molecules would be restricted because of which their entropy would be less and approach zero at extremely low temperature (close to zero).