Fire hydrant and heat pump: what they have in common

1. Step 1. Fire hydrant — is used in — Fire truck. Connection.
2. Step 2. Fire truck — has part — Centrifugal pump. A fire pump.
3. Step 3. Centrifugal pump — has part — Impeller. The impeller accelerates the liquid.
4. Step 4. Impeller — is part of — Compressor. A centrifugal compressor is an impeller.
5. Step 5. Compressor — is part of — Heat pump. A compressor.

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