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Feb19-13, 06:26 PM
Sci Advisor
P: 8,790
The key achievement is that entropy defined by Clausius dS=dQrev/T is a state property.

In general, you can imagine that to predict what is going to happen next, you need to know everything that happened before. However, the special property of a state variable is that to make a prediction, you just need to know it at one moment in time. (That's the rough idea.)

An example of something that isn't a state property is the work done on an object - that depends on the path through which you moved an object.

Mathematically, he discovered what is called an "integrating factor".