hydrogen
Meaning 1:
Hydrogen is a gas that we can't see, but it is everywhere around us. It is the lightest and simplest element. It is like a tiny invisible friend that helps make things burn and explode.
Other Words
Hydrogen is a gas that we can't see, but it is everywhere around us. It is the lightest and simplest element. It is like a tiny invisible friend that helps make things burn and explode.