Here's why:
* Hydrogen's boiling point is -252.87°C (-423.17°F). This means that at temperatures above this point, hydrogen will be in its gaseous state.
* 20°C is significantly higher than hydrogen's boiling point. Therefore, hydrogen will be a gas at this temperature.
However, it's important to remember that hydrogen is a very light element, and its behavior can be influenced by pressure. At very high pressures, hydrogen can become a liquid even at temperatures above its boiling point.
