Shoe upper and heat pump: what they have in common

1. Step 1. Shoe upper — is part of — Footwear. The upper blank.
2. Step 2. Footwear — is made of — Leather. Leather.
3. Step 3. Leather — is material for — Piston. They were sealed with a leather cup.
4. Step 4. Piston — is part of — Watt steam engine. Steam pushes the piston 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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