A measure of disorder in a system, defined by the number of microstates yielding an equivalent macrostate or by shannon entropy in information theory.
(thermodynamics, countable) A measure of the amount of energy in a physical system that cannot be used to do work.
The capacity factor for thermal energy that is hidden with respect to temperature.
The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature.
(statistics, information theory, countable) A measure of the amount of information and noise present in a signal.
(uncountable) The tendency of a system that is left to itself to descend into chaos.