Vice and heat pump: what they have in common

1. Step 1. Vice — uses — Screw. The jaws are closed by a screw.
2. Step 2. Screw — is used in — Propeller. A propeller “screws” itself into the water, like an Archimedes’ screw.
3. Step 3. Propeller — is part of — Electric fan. The blades.
4. Step 4. Electric fan — has part — Impeller. A fan's blades are an impeller that pushes the air.
5. Step 5. Impeller — is part of — Compressor. A centrifugal compressor is an impeller.
6. Step 6. Compressor — is part of — Heat pump. A compressor.

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