Central heating and radar: what they have in common

1. Step 1. Central heating — has part — Centrifugal pump. A circulation pump.
2. Step 2. Centrifugal pump — has part — Impeller. The impeller accelerates the liquid.
3. Step 3. Impeller — is part of — Turbofan. A fan.
4. Step 4. Turbofan — is part of — Jet airliner. Modern airliners use turbofans.
5. Step 5. Jet airliner — has part — Radar. A weather radar.

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