Pinball and liquid-propellant rocket engine: what they have in common

1. Step 1. Pinball — has part — Electromagnet. Flippers are solenoids.
2. Step 2. Electromagnet — is part of — Bubble chamber. The field bends the tracks.
3. Step 3. Bubble chamber — is made of — Hydrogen. The working medium is superheated liquid hydrogen.
4. Step 4. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.

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