Handle wedge and heat pump: what they have in common

1. Step 1. Handle wedge — is part of — Hammer. It wedges the handle in the eye.
2. Step 2. Hammer — evolved into — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
3. Step 3. Steam hammer — has part — Cylinder. A steam cylinder.
4. Step 4. Cylinder — is part of — Watt steam engine. Steam works in the cylinder.
5. Step 5. Watt steam engine — inspired — Thermodynamics. Carnot wrote “Reflections on the Motive Power of Fire” trying to understand steam engines.
6. Step 6. Thermodynamics — is used in — Heat pump. A heat pump moves heat from cold to warm by spending work — by the laws of thermodynamics.

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