Yoke and heat pump: what they have in common

1. Step 1. Yoke — is used in — Plough. It was pulled by oxen in a yoke.
2. Step 2. Plough — evolved into — Steel plough. A steel share.
3. Step 3. Steel plough — is used in — Tractor. Ploughing with a tractor.
4. Step 4. Tractor — evolved from — Watt steam engine. The first tractors were steam-powered.
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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