thermal equilibrium

noun Thermodynamics.
the relationship between two systems connected only by a diathermic wall.
the relationship between two isolated systems the states of which are such that no net transfer of energy would occur between them if they were connected by a diathermic wall. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
thermal equilibrium  
The condition under which two substances in physical contact with each other exchange no heat energy. Two substances in thermal equilibrium are said to be at the same temperature. See also thermodynamics.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

thermal equilibrium definition

In physics and chemistry, a condition in which all parts of a system are at the same temperature.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences
The heat resulting from industry really has no effect, but shifting the thermal
  equilibrium with greenhouse gases does.
The two materials will be in thermal equilibrium when they reach the same
  temperature, not the same internal energy.
The observed potential of the system will drift until thermal equilibrium is
So, objects can attain thermal equilibrium even in a vacuum, bu exchanging
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