Yoke e heat pump: o que têm em comum

1. Passo 1. Yoke — é utilizado em — Plough. It was pulled by oxen in a yoke.
2. Passo 2. Plough — evoluiu para — Steel plough. A steel share.
3. Passo 3. Steel plough — é utilizado em — Tractor. Ploughing with a tractor.
4. Passo 4. Tractor — evoluiu de — Watt steam engine. The first tractors were steam-powered.
5. Passo 5. Watt steam engine — inspirou — Thermodynamics. Carnot wrote “Reflections on the Motive Power of Fire” trying to understand steam engines.
6. Passo 6. Thermodynamics — é utilizado em — Heat pump. A heat pump moves heat from cold to warm by spending work — by the laws of thermodynamics.

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