Soldering iron and aerosol can: what they have in common

1. Step 1. Soldering iron — has part — Heating element. A heater.
2. Step 2. Heating element — is part of — Dishwasher. Heating the water.
3. Step 3. Dishwasher — has part — Centrifugal pump. A pump feeds water to the spray arms.
4. Step 4. Centrifugal pump — is part of — Central heating. A circulation pump.
5. Step 5. Central heating — has part — Valve. Valves on the radiators set how much hot water flows into a room.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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