Two physical systems are
in thermal equilibrium if no heat flows between them when they are connected by
a path permeable to heat. Thermal equilibrium obeys the Zeroth Law of
Thermodynamics. A system is said to be in thermal equilibrium with itself if the
temperature within the system is spatially and temporally uniform.
When
the system should in thermally, chemically and physically
equilibrium then we can say that the system are in thermodynamic equilibrium so
systems in thermodynamic equilibrium are always in thermal equilibrium but it
is not necessary that system in thermal equilibrium are always in
thermodynamic equilibrium.
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