Aeration tank with bubbling water and liquid-propellant rocket engine: what they have in common

1. Step 1. Aeration tank with bubbling water — is part of — Sewage treatment plant. A tank where activated sludge breaks down pollutants.
2. Step 2. Sewage treatment plant — uses — Fermentation. Activated sludge is microbes.
3. Step 3. Fermentation — is used in — Ethanol. Alcohol is produced by fermentation.
4. Step 4. Ethanol — is material for — V-2 rocket. The fuel is ethyl alcohol.
5. Step 5. V-2 rocket — is a kind of — Liquid-propellant rocket engine. A liquid-propellant engine.

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