eli5: if you need to put energy to rise the temperature of the substance, why cant you generate energy by cooling something down?
In: 6
You can and do, that’s pretty much literally how we generate energy.
The way you “cool” something in a controlled way can use the term “doing work”.
Hot steam “does work” turns to colder steam/water and then generates electricity.
Hot exhaust gases in a car “do work” then turn colder and generate energy for the engine.
etc. etc.
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