Why the molecular motion of the molecules ceases at zero kelvin? - Vidyadip

Question

Why the molecular motion of the molecules ceases at zero kelvin?

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Answer

We know, kinetic energy of a molecule is proportional to the absolute temperature. i.e., $\frac{1}{2}\text{mv}^2_\text{rms}\propto\text{T}$ At $\text{T}=0$$\frac{1}{2}\text{mv}^2_{\text{rms}}=0,$ Since $\frac{1}{2}\text{m}\neq0,\therefore\text{v}_{\text{rms}}=0$
Thus molecular motion ceases at zero kelvin.

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