Определение internal energy в Английский Язык Английский Язык словарь
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
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