Hydrogen is a Nonmetal that has no color. There is no smell and can ignite hydrogen. There will be a lot lighter than air, so it put in balloons and as fuel.
Hydrogen is a colorless, odorless, non-metal elements and can be flammable. Hydrogen is lighter than air so much. Therefore put on the balloons. And fuels
Hydrogen is a nonmetal with no color, no smell and can ignite hydrogen is lighter than air, so much weight. So popular put in balloons. A substance and fuel.