# Why is liquid nitrogen so cold?

##### 1 Answer
Nov 14, 2015

Nitrogen is a pure, elemental substance. Any such substance has constant physical properties such as melting point, and boiling point.

#### Explanation:

Nitrogen is characterized by a boiling point of $- {196}^{\text{o}}$ $C$. At this temperature its vapour pressure is $1$ $a t m$. Why is the boiling point of nitrogen so low? Well, only weak dispersion forces operate between the nitrogen molecules.