Here's why:

* Nitrogen's boiling point: Nitrogen has a boiling point of -195.79 °C (-320.42 °F). This means it transitions from a liquid to a gas at this temperature.

* Room temperature: Room temperature is typically considered to be around 20-25 °C (68-77 °F). This is significantly higher than nitrogen's boiling point.

Therefore, at room temperature, nitrogen exists in its gaseous state.