Reusable rocket and aerosol can: what they have in common

1. Step 1. Reusable rocket — has part — Liquid-propellant rocket engine. Liquid-propellant engines.
2. Step 2. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.
3. Step 3. Centrifugal pump — is part of — Central heating. A circulation pump.
4. Step 4. Central heating — has part — Valve. Valves on the radiators set how much hot water flows into a room.
5. Step 5. Valve — is part of — Aerosol can. A valve.

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