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If one defines the order of a system as the number of possible microstates that make up the system then entropy is a function of the number of microstates. The less the number of microstates the more ordered the system.
For example water vapour has a large spectrum (microstates) of water molecules of differing kinetic energies. In the liquid and solid states the spectrum is correspondingly less. Hence entropy decreases as one goes from gas to liquid to solid.
Regards
Steven
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