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iit jee Grade: Upto college level
`        WHAT IS ENTROPY ALL ABOUT ?????     PLZZZZZZZ    EXPLAIN..........`
6 years ago

419 Points
```										Dear Student
The extent of disorder or randomness in a system may be expressed by a  property known as entropy. Entropy may be termed as the property of a  system which measures the degree of disorder or randomness in the  system. It is generally expressed by the symbol, S. Entropy like  internal energy and enthalpy, is a state function and change in entropy  therefore, depends only on the initial and final states of the system.  The change in entropy during the process when a system undergoes a  change from one state to another is represented by DS. Thus, DS = S(final state) - S(initial state) and for chemical reactions, DS = S(products) - S(reactants). For a reversible process at equilibrium, the change in entropy may be expressed as:
DS = qrev / T
where qrev represents the heat supplied at temperature T in a reversible process.
Units of entropy
Since  entropy change is expressed as heat divided by temperature, the units  of entropy are calories per degree (expressed as entropy units eu) or  joules per kelvin, JK-1 (expressed as EU).
Physical meaning of Entropy
The physical meaning of entropy  is that entropy is a measure of degree of disorder (or randomness) of a  system. The relation between entropy and disorder provides a suitable  explanation for entropy change in various processes. The greater the  disorder in a system, the higher is the entropy. Obviously, for a given  substance the solid state is the state of lowest entropy (most ordered  state), the gaseous state is the state of highest entropy and the liquid  state, is intermediate between the two. In the case of mixing of two  gases when the stopcock is opened, the gases mix to achieve more  randomness or disorder. In this case, there is no exchange of matter or  energy between the system and the surroundings. The change occurs from  ordered state (less entropy) to disordered state (higher entropy). Thus  the change in entropy is positive.

All the best.
AKASH GOYAL

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6 years ago
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