[T]he production of heat alone is not sufficient to give birth to the impelling power: it is necessary that there should also be cold; without it, the heat would be useless. (Nicolas Léonard Sadi Carnot)

[T]he production of heat alone is not sufficient to give birth to the impelling power: it is necessary that there should also be cold; without it, the heat would be useless.

Nicolas Léonard Sadi Carnot

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birth cold heat necessary power production should

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