A certain property of a body, expressed as a measurable quantity, such that when there is no communication of heat the quantity remains constant, but when heat enters or leaves the body the quantity increases or diminishes. If a small amount, h, of heat enters the body when its temperature is t in the thermodynamic scale the entropy of the body is increased by h &?; t. The entropy is regarded as measured from some standard temperature and pressure. Sometimes called the thermodynamic function.
- For a closed thermodynamic system, a quantitative measure of the amount of thermal energy not available to do work.
- A measure of the disorder or randomness in a closed system.
- A measure of the loss of information in a transmitted message.
- The tendency for all matter and energy in the universe to evolve toward a state of inert uniformity.
- Inevitable and steady deterioration of a system or society.