Second Law of Thermodynamics
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The second law of thermodynamics deals with entropy (S) which is a
measure of disorder. The second law says that the entropy of the
universe increases. An increase in an overall disorder is a
spontaneous
change. If the volume and energy of a system are both the same
, then every change in that system increases the entropy. If either
the volume or energy changes, then the entropy of the system can actually
decrease.
But, the entropy of the universe doesn't decrease. The molecules in
one's body exist in great order; this only happens because the entropy of
the rest of the universe is increasing to a greater amount than the entropy
of the body, which is decreasing.
