
A system is at thermodynamic equilibrium if the energy it gains from its surroundings is exactly balanced by the energy it loses, no matter how much time is allowed to pass.
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http://antoine.frostburg.edu/chem/senese/101/glossary/t.shtml

Thermodynamic equilibrium is an axiomatic concept of classical thermodynamics. It is an internal state of a single thermodynamic system, or a relation between several thermodynamic systems connected by permeable walls. In thermodynamic equilibrium there are no net macroscopic flows of matter or of energy, either within a system or between systems....
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http://en.wikipedia.org/wiki/Thermodynamic_equilibrium

condition or state of a thermodynamic system, the properties of which do not change with time and that can be changed to another condition only at ... [3 related articles]
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http://www.britannica.com/eb/a-z/t/37

<radiobiology> There is a very general result from statistical mechanics which states that, if a system is in thermodynamic equilibrium with another (or several other) system, all processes by which the systems can exchange energy must be exactly balanced by their reverse processes, so that there is no net exchange of energy. For plasma syste...
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http://www.encyclo.co.uk/local/20973

This type of equilibrium describes a condition in a system where the distribution of mass and energy moves towards maximum entropy.
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http://www.physicalgeography.net/physgeoglos/t.html

A system is at thermodynamic equilibrium if the energy it gains from its surroundings is exactly balanced by the energy it loses, no matter how much time is allowed to pass. See also: Thermodynamics.
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https://www.encyclo.co.uk/local/20687
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