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When the several changes are... such... that... the body returns to its original condition... these changes form a cyclical process, we haveand...

— Rudolf Clausius The Mechanical Theory of Heat (1867)

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More quotes by Rudolf Clausius

The entropy of the universe tends to a maximum.

The Mechanical Theory of Heat (1867)

The energy of the universe is constant.

The Mechanical Theory of Heat (1867)

T is simply the absolute temperature.

The Mechanical Theory of Heat (1867)

Theorem of the equivalence of Heat and Work. ...Mechanical work may be transformed into heat, and conversely heat into work, the magnitude of the of the one being always proportional to that of the other.

The Mechanical Theory of Heat (1867)

When Q is negative... it will indicate that the quantity... transformed... from heat into work.

The Mechanical Theory of Heat (1867)

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Quote text and notes from Wikiquote: Rudolf Clausius (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.