Hot water storage tank and parachute: what they have in common

1. Step 1. Hot water storage tank — is part of — Solar water heater. A store of hot water.
2. Step 2. Solar water heater — uses — Heat transfer. Heating the water.
3. Step 3. Heat transfer — is used in — Heat shield. It protects by carrying heat away with a vaporizing layer.
4. Step 4. Heat shield — is part of — Vostok 1. A spherical descent capsule with a heat shield.
5. Step 5. Vostok 1 — has part — Parachute. Gagarin landed by parachute.

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