Why is liquid nitrogen so cold?

Question: Why is liquid nitrogen so cold?
- Keywords:
  cold,
  liquid nitrogen,
  temperature
Asked by Qwertyman123 to Áine on 18 Nov 2014.
- Áine Broderick answered on 18 Nov 2014:
  
  It is because nitrogen has a really low freezing point, which means that when it is a liquid it is still really cold, about -210 degrees C.

Question: Why is liquid nitrogen so cold?