Hall–Héroult process and liquid-propellant rocket engine: what they have in common

1. Step 1. Hall–Héroult process — uses — Electrolysis. Electrolysis of a melt.
2. Step 2. Electrolysis — is used in — Hydrogen. Hydrogen is produced by electrolysis of water.
3. Step 3. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.

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