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. (Hermann von Helmholtz)

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.

Hermann von Helmholtz

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essential fine fundamental heat imponderable matter nature property quantity substance view unchangeable

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