Brine-soaked cloth discs and centrifugal pump: what they have in common

1. Step 1. Brine-soaked cloth discs — is part of — Voltaic pile. Cloth soaked in brine.
2. Step 2. Voltaic pile — evolved into — Electrolysis. The first electrolysis of water was powered by a voltaic pile.
3. Step 3. Electrolysis — is used in — Hydrogen. Hydrogen is produced by electrolysis of water.
4. Step 4. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.
5. Step 5. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.

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