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

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Energy content of the system is generally comprised of available energy + unavailable energy. Available energy is nothing but enthalpy whereas unavailable energy is Entropy. In other words Entropy is the energy content of a system which is unavailable for conversion into useful work. Example could be , the heat liberated during friction is unavailable for any useful work and this heat is wasted in the universe. Therefore Entropy of the universe is kept on increasing.
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a thermodynamic quantity representing the unavailability of a system's thermal energy for conversion into mechanical work, often interpreted as the degree of disorder or randomness in the system.

The word entropy is sometimes confused with energy. Although they are related quantities, they are distinct. Energy measures the capability of an object or system to do work. Entropy, on the other hand, is a measure of the "disorder" of a system.

According to the second law of thermodynamics - that entropy always increases with time"

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In thermodynamics, entropy (usual symbol S) is a measure of the number of specific realizations or microstates that may realize a thermodynamic system in a defined state specified by macroscopic variables.
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a thermodynamic quantity representing the unavailability of a system's thermal energy for conversion into mechanical work, often interpreted as the degree of disorder or randomness in the system.

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Entropy is measure of randomness. Entropy of universe never decreases.

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Entropy is the unaccountable energy. It means its the energy which cant be used or converted into another energy form for utilisation.

So we try to achieve minimum entropy regarding any process.

This is the simplest explanation for entropy, with reference to this you can read explanations in books in mathematical forms

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