Anode (graphite) and centrifugal pump: what they have in common

1. Step 1. Anode (graphite) — is part of — Fuel cell. An anode with a catalyst for hydrogen.
2. Step 2. Fuel cell — uses — Hydrogen. The fuel is hydrogen.
3. Step 3. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.
4. Step 4. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.

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