from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The total kinetic and potential energy associated with the motions and relative positions of the molecules of an object, excluding the kinetic or potential energy of the object as a whole. An increase in internal energy results in a rise in temperature or a change in phase.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a property, characteristic of the state of a thermodynamic system, the change of which is equal to the heat absorbed minus the work done by the system
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