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In the cases of heat and electricity the form of the persisting energy is pretty well ascertained. But there are cases in which we do not know if it is energy of motion or energy position, such as that of . In the burning of coal there is a falling together of carbon and oxygen but we do not know in which of the two forms, if either, the energy which comes out as heat existed in the chemical process. For such a case the is only a probable statement to the effect that in all cases where a physical quality is convertible with energy, that quality is itself either energy of motion or energy position. (en) |
