Question

Why is liquid nitrogen so cold?

Answer 1

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^"o"` `C`. At this temperature its vapour pressure is `1` `atm`. Why is the boiling point of nitrogen so low? Well, only weak dispersion forces operate between the nitrogen molecules.