is Hydrogen flammable?

Yes, hydrogen is a flammable gas which can ignite with concentrations as low as 4% in air. However, due to the low density of hydrogen, any leakage typically rises rapidly and disperses into the ambient environment before ignition. 

What are the precautions required when using hydrogen?

Vent: Natural or forced convection should be used to vent hydrogen to the environment in the event of leakage. 

No naked flame: Naked flames are not permitted near hydrogen installations. 

Regulations might differ between regions. Please consult your local authority for guidelines on hydrogen usage.

Can hydrogen gas be made into a hydrogen bomb?

No, commercial hydrogen gas cannot be made into a hydrogen bomb as there is no significant quantity of hydrogen isotopes within it.