Radio frequency cavities and fuel cell: what they have in common

1. Step 1. Radio frequency cavities — is part of — Particle accelerator. They accelerate particles with a field.
2. Step 2. Particle accelerator — uses — Electromagnet. Bending magnets.
3. Step 3. Electromagnet — is part of — Bubble chamber. The field bends the tracks.
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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