Question: What would happen if you mixed nitrogen with helium

Kieran answered on 6 Nov 2018:

Nitrogen and helium are both gases and neither are reactive so they would just mix in the air as they do when you burst a helium balloon. The balloon bursts and the helium mixes with the nitrogen in the air with no reaction.

However, if you were to mix oxygen and hydrogen with a source of fire it would create an explosion. This reaction powers rockets to send them into space!