ELI5: Explain Like I'm 5

Hydrogen tank

A hydrogen tank is a type of container that's used to store and transport hydrogen. They are made of strong metal like steel and aluminum. Inside the tank, hydrogen is stored in a completely sealed environment, keeping it from reacting with the outside world. Hydrogen tanks are filled with pressurized hydrogen gas, which helps it to stay in the tank and not escape. When it's time to use the hydrogen, the tank is opened and the gas is allowed to flow out and be used up.