Nitrous oxide (N₂O) is a gas at room temperature and pressure. It's commonly used in dentistry and as a propellant in whipped cream cans. In these applications, it's dissolved in a liquid, typically liquefied nitrous oxide.

Therefore, when thinking about the solute and solvent in these situations:

* Nitrous oxide (N₂O) is the solute because it's the component that is dissolved.

* Liquefied nitrous oxide is the solvent because it's the component that dissolves the nitrous oxide.

It's important to remember that in the context of a gas, there isn't a clear distinction between solute and solvent, as the molecules are mixed uniformly. The concept of solute and solvent is more relevant when considering the dissolving of a solid or gas in a liquid.