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second law of thermodynamics

قانون ِ دوم ِ گرماتوانیک

qânun-e dovom-e garmâtavânik

Fr.: deuxième loi de la thermodynamique

1) Heat cannot be transferred from a colder to a hotter body without some other effect, i.e.
without → work being done. Expressed in terms of
→ entropy: the entropy of an
→ isolated system tends toward a maximum and its
available energy tends toward a minimum.
2) In language of → statistical physics,
an isolated physical system will tend toward an
equilibrium → macrostate
with as large a total → entropy
as possible, because then the number of → microstates
is the largest. See also
→ Kelvin's postulate,
→ Clausius's postulate.