Liquid nitrogen is a pure substance, not a solution. It is nitrogen in its liquid state.

Here's why there's no solvent and solute:

* Solutions are mixtures where one substance (the solute) dissolves completely into another substance (the solvent).

* Liquid nitrogen is a single substance, nitrogen, in its liquid form.

Think of it like this: You can't dissolve sugar into water if you only have water. Similarly, there's nothing to dissolve in liquid nitrogen because it's already a pure substance.