Atomic nucleus and centrifugal pump: what they have in common

1. Step 1. Atomic nucleus — uses — Radioactivity. Alpha particles in Rutherford’s experiment.
2. Step 2. Radioactivity — is used in — Cloud chamber. Particle tracks.
3. Step 3. Cloud chamber — evolved into — Bubble chamber. A liquid instead of vapour.
4. Step 4. Bubble chamber — is made of — Hydrogen. The working medium is superheated liquid hydrogen.
5. Step 5. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.
6. Step 6. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.

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