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The older view of the nature of heat was that it is a substance, very fine and imponderable indeed, but indestructible, and unchangeable in quantity, which is an essential fundamental property of all matter.
旧的关于热的本质的观点是，热是一种物质，非常精细，不可估量，但不可摧毁，而且数量不可改变，这是所有物质的基本属性。