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What do you mean by entropy?

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IIT JEE Mains and advanced.

Entropy is a measure of disorder, or the energy loss in a process during its state changes in irreversible manner. A simple example of the entropy can be understood in the following way. consider a non reversible process which can happen in many ways, e.g. Expanding a gas in cylinder from high pressure...
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Entropy is a measure of disorder, or the energy loss in a process during its state changes in irreversible manner. A simple example of the entropy can be understood in the following way.

consider a non reversible process which can happen in many ways, e.g. Expanding a gas in cylinder from high pressure to low pressure. It is understood that this can happen in plenty of way by extracting a work from system. If we allow a sudden expansion of the gas, it will generate high entropy, however if we expand the gas with slow pressure changes then the entropy generated is less. In general an entropy can be considered as the degradation of the energy when high quality energy (mechanical) is converted in to low quality energy (heat) 

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Many thermodynamically feasible reactions do not occur under ordinary conditions. Why?

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