Question

What is an entropy change

Answer 1

Entropy is the amount of disorder in a substance or system or universe.

For gases we can say that it is the energy they have , as the more energy they have , the molecules go around in all directions.  The entropy is proportional to the temperature, as temperature increases disorder increases.

When there is an exchange of heat across boundaries of a system to its environment or between two systems or bodies, then the entropy of each system changes.   Entropy decreases when heat is released or given out.

Answer 2

Answer:

Entropy, the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work.

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