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The Epic Interactive Encyclopedia 1997
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1992-09-02
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In thermodynamics, a parameter representing
the state of disorder of a system at the
atomic, ionic, or molecular level; the
greater disorder, the higher the entropy.
Thus the fast-moving disordered molecules of
water vapour have higher entropy than those
of more ordered liquid water, which in turn
have more entropy than the molecules in solid
crystalline ice. At absolute zero (0K/-273
degrees C/-459.67 degrees F), when all
molecular motion ceases and order is assumed
to be complete, entropy is zero. In a closed
system undergoing change, entropy is a
measure of the amount of energy unavailable
for useful work. At absolute zero (-273
degrees C/-459.67 degrees F/0K), when all
molecular motion ceases and order is assumed
to be complete, entropy is zero.