Electrolysis and steam turbine: what they have in common

1. Step 1. Electrolysis — is used in — Hydrogen. Hydrogen is produced by electrolysis of water.
2. Step 2. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.
3. Step 3. Liquid-propellant rocket engine — has part — De Laval nozzle. A nozzle.
4. Step 4. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.

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