Question

What is finally entropy?

Answer 1

Let's say that a layman reads the definitions of entropy with the chronological order of their formulation.

First definition: heat weighted by temperature inverted.

Second definition: logarithm of possible microstates

Third definition: hidden but conserved information as we go from the world of Avogadro numbers to the macroscopic world that we sense and live.

Of course all definitions are equally true. All these definitions belong to the realm of thermodynamics, they explain thermodynamic concepts as temperature and heat.

Answer 2

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Here is your answer

Entropy is a measure of randomness of disorderness of the system

For a given substance the crystalline solid state has the lowest entropy and the gaseous state has the highest entropy and the liquid has the entropy in between them

» Entropy is a state function and extensive property

»For a spontaneous processes in the isolated system the entropy change is positive