unavailable energy


Also found in: Idioms.

unavailable energy

[¦ən·ə¦vāl·ə·bəl ′en·ər·jē]
(thermodynamics)
That part of the energy which, when an irreversible process takes place, is initially in a form completely available for work and is converted to a form completely unavailable for work.
References in periodicals archive ?
Jacob Bekenstein on whether a black hole can radiate, but in the end the two physicists in the 1970s jointly developed the theory of Bekenstein-Hawking entropy -- a measure of the unavailable energy in a closed thermodynamic system which is also usually considered to be a measure of the system's disorder.
The minimum energy that has to be rejected to the sink by the second law is called the "Unavailable Energy (U.E.)" Available and unavailable energy in a cycle are shown in Figure 4.
With the addition of other stressors such as the emotional reactions to several losses and coping with reactions of family and friends, a great deal of unavailable energy may be required.