* Liquid nitrogen is nitrogen in its liquid state. It's the same chemical substance, just in a different phase.
* Gases and liquids are in equilibrium at a specific temperature and pressure. The liquid nitrogen will boil off and become nitrogen gas as the temperature rises.
Here's how to think about it:
Imagine you have a container with liquid nitrogen. As the temperature rises, some of the liquid nitrogen will boil and turn into gas. You'll end up with a mixture of gas and liquid nitrogen in the container. There's no way to separate the two because they are the same substance, just in different phases.
Instead of separating them, you can simply:
* Let the liquid nitrogen boil off completely. This will leave you with only nitrogen gas.
* Maintain the liquid nitrogen at a low enough temperature. This will keep it in its liquid state.
Let me know if you have any other questions about nitrogen or its properties!
