Archimedes’ principle and liquid-propellant rocket engine: what they have in common

1. Step 1. Archimedes’ principle — is used in — Weather balloon. A balloon filled with hydrogen or helium.
2. Step 2. Weather balloon — is made of — Hydrogen. Filled with hydrogen or helium.
3. Step 3. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.

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