Safety valve and fuel cell: what they have in common

1. Step 1. Safety valve — is part of — Boiler. A mandatory safeguard for boilers.
2. Step 2. Boiler — uses — Latent heat. Evaporation needs latent heat.
3. Step 3. Latent heat — is used in — Bubble chamber. A particle leaves a trail of boiling bubbles.
4. Step 4. Bubble chamber — is made of — Hydrogen. The working medium is superheated liquid hydrogen.
5. Step 5. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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