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How is thermal energy converted into mechanical energy?

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Quick: what do surveying and thermodynamics have in common? Answer: statistics! Do you know those giant ball pits that kids play in? The ones where you can pretty much jump in and swim around without getting wet? read more

The generic term for a device that converts therman energy into mechanical energy is"heat engine". Wikipedia has a pretty good explanation with helpful diagrams at Heat engine. Typcially, they rely on expansion of fluidsd, as Gao mentioned, but there are important exceptions covered at Wikipedia. read more

A heat pump is the efficient way to"convert" mechanical energy to heat energy. A heat pump is just an air conditioner running backwards although usually you want a heat source other than the outside air - something warmer in the winter to take the heat from. read more

Converting work to heat is relatively easy and conservation of energy says that all the mechanical energy must be converted to some other form so unless that energy is being stored as kinetic energy, potential energy or some other form that DOESN'T create heat, it's all going to be heat. read more

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