Question

Is hydrogen a solid, liquid, or gas at room temperature?

Answer 1

Hydrogen is a gas at room temperature. It is in the air that you breathe.

Explanation:

The boiling point of hydrogen is `−252.879 °"C"` at standard pressure.

To get hydrogen to the liquid state, the temperature must be below its critical temperature of `"33 K"` or `-240.15^@"C"` and must be at a minimum pressure of `"13 atm"`.
https://sciencing.com/liquefy-hydrogen-5220130.html