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English to English noun
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(communication theory) a numerical measure of the uncertainty of an outcome |  | Example: the signal contained thousands of bits of information
source: wordnet30
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(thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work | | Example: entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity
source: wordnet30
| 3 |
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. | | source: webster1913
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