Entropy:

Entropy

Although the entropy s important technical and philosophical overtones, we will use this property in specific and limited. The entropy will have a lot of graphs and tables properties and is mentioned here, so it will not be unfamiliar. The following two implications of this property:

If the gas or vapour is compressed or expanded frictionlessly without addition or removal of heat during the entropy of matter remains constant.
The process described in the involvement 1, the enthalpy change represents the amount of work per unit mass needed compression or delivered expansion.

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Possibly the greatest practical use we shall have for entropy is to read lines of constant entropy on graphs in computing the work of compression in vapor-compression i frigeration cycles.

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