Oil refining and boiler: what they have in common

1. Step 1. Oil refining — is used in — Petrol. Petrol is a product of crude oil distillation.
2. Step 2. Petrol — is used in — Carburettor. It mixes petrol with air.
3. Step 3. Carburettor — has part — Valve. A throttle valve in the carburettor sets how much fuel-air mix reaches the engine.
4. Step 4. Valve — is part of — Central heating. Valves on the radiators set how much hot water flows into a room.
5. Step 5. Central heating — has part — Boiler. A boiler.

Open Evothings