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Steam engine
water
A steam engine uses a hydrocarbon based fuel source. The combustion of the fuel releases the chemical energy in the bonds in the form of thermal energy.
The energy source in a steam engine is the heat source that converts water into steam thus creating pressure. The heat source itself can be a coal, wood, gas or petroleum burner but can also be something different like a solar panel or a nuclear reactor (most nuclear reactors are themselves steam engines-generators).
The function of the steam engine is to convert heat energy into motive power, mechanical energy. A boiler generates steam by the application of heat, that steam is then expanded (losing its heat energy) into a steam engine which moves a load (locomotive, line shaft, pump, machine, generator, etc.).
Steam engine
the steam engine
the steam engine
the steam engine
Other to coal I suppose you mean. Burning of any fuel like oil, wood, etc. Nuclear reactors. I suspect solar energy would make steam. It would be possible to use natural steam from deep in the ground.
steam engine
The steam engine was the first convenient source of power. It powered the industrial revolution as well as ships and trains in it's day.