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Entropy is a concept introduced when dealing with
heat (engine) problem. It is closely related to energy
but not conserved.
The thermodynamic laws 2 and 3 are concerned with entropy.
Entropy is not yet scientifically matured, some disciplines have
their own definitions, so using it carelessly may cause many
confusions.
For example, humans can be considered open systems
with oxygen as input and walking, running or doing other works
as output. So the entropy for humans are always decreasing
no matter what you do because they are also
equal temperature system (Q / T).
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