Eli5: How is hydrogen, a potent source of fuel with high energy release, combined with oxygen, a facilitator for combustion and energy release, mix together to make water which we drink like it’s no big deal?

Question

bonus points if you can explain why water has no caloric value, but hydrogen can power huge machinery.

In: 3

Answer 1

Hydrogen ions can be used to power engines. Hydrogen fuel cells split hydrogen into hydrogen ions and electrons, the electrons are then used for power and the hydrogen ions, electrons and oxygen are then combined to make water. https://youtu.be/gh95X3Qb6zo

Hydrogen can also be fused together in stars releasing nuclear fusion energy.