Monday, March 24, 2014

Vocab word of the week

en·tro·py  [en-truh-pee]
1. Thermodynamics .
a.(on a macroscopic scale) a function of thermodynamic variables, as temperature, pressure, or composition, that is a measure of the energy that is not available for work during a thermodynamic process. A closed system evolves toward a state of maximum entropy.
b.(in statistical mechanics) a measure of the randomness of the microscopic constituents of a thermodynamic system. Symbol:  S
2.(in data transmission and information theory) a measure of the loss of information in a transmitted signal or message.
3.(in cosmology) a hypothetical tendency for the universe to attain a state of maximum homogeneity in which all matter is at a uniform temperature (heat death)
4.a doctrine of inevitable social decline and degeneration.

World English Dictionary
entropy  (ˈɛntrəpɪ)

— n  , pl -pies
1. See also law of thermodynamics S  a thermodynamic quantity that changes in a reversible process by an amount equal to the heat absorbed or emitted divided by the thermodynamic temperature. It is measured in joules per kelvin
2. a statistical measure of the disorder of a closed system expressed by S  = k log P  + c  where P  is the probability that a particular state of the system exists, k  is the Boltzmann constant, and c  is another constant
3. lack of pattern or organization; disorder
4. a measure of the efficiency of a system, such as a code or language, in transmitting information

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