entropy

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entropy

 [en´trŏ-pe]
1. in thermodynamics, a measure of the part of the internal energy of a system that is unavailable to do work. In any spontaneous process, such as the flow of heat from a hot region to a cold region, entropy always increases.
2. the tendency of a system to move toward randomness.
3. in information theory, the negative of information, a measure of the disorder or randomness in a physical system. The theory of statistical mechanics proves that this concept is equivalent to entropy as defined in thermodynamics.
4. diminished capacity for spontaneous change, as occurs in the psyche in aging.

en·tro·py (S),

(en'trŏ-pē),
That fraction of heat (energy) content not available for the performance of work, usually because (in a chemical reaction) it has been used to increase the random motion of the atoms or molecules in the system; thus, entropy is a measure of randomness or disorder. Entropy occurs in the Gibbs free energy (G) equation: ΔG = ΔH - TΔSH, change in enthalpy or heat content; T, absolute temperature; ΔS, change in entropy; ΔG, change in Gibbs free energy).
See also: second law of thermodynamics.
[G. entropia, a turning toward]

entropy

/en·tro·py/ (en´tro-pe)
1. the measure of that part of the heat or energy of a system not available to perform work; it increases in all natural (spontaneous and irreversible) processes. Symbol S.
2. the tendency of any system to move toward randomness or disorder.
3. diminished capacity for spontaneous change.

entropy

[en′trəpē]
Etymology: Gk, en + tropos, a turning
the tendency of a system to change from a state of order to a state of disorder, expressed in physics as a measure of the part of the energy in a thermodynamic system that is not available to perform work. According to the principles of evolution, living organisms tend to go from a state of disorder to a state of order in their development and thus appear to reverse entropy. However, maintaining a living system requires the expenditure of energy, leaving less energy available for work, with the result that the entropy of the system and its surroundings increases.

en·tro·py

(S) (en'trŏ-pē)
That fraction of heat (energy) content not available for the performance of work, usually because (in a chemical reaction) it has been used to increase the random motion of the atoms or molecules in the system; thus, a measure of randomness or disorder.
[G. entropia, a turning toward]

entropy

the amount of disorder or the degree of randomness of a system. For example, when a protein is denatured by heat (see DENATURATION), the molecule (which has a definite shape) uncoils and takes up a random shape, producing a large change in entropy.

entropy (enˑ·tr·pē),

n the propensity of matter and energy in a closed system to degrade into an equilibrium of uniform inertness and disorder. The apparent suspension of entropy in animate systems is used to support the philosophy of vitalism.

entropy

1. in thermodynamics, a measure of the part of the internal energy of a system that is unavailable to do work. In any spontaneous process, such as the flow of heat from a hot region to a cold region, entropy always increases.
2. in information theory, the negative of information, a measure of the disorder or randomness in a physical system. The theory of statistical mechanics proves that this concept is equivalent to entropy as defined in thermodynamics.
References in periodicals archive ?
Optimization Stage is calculating how the Process Causal Phases are evolving, how the Entropy is flowing, being permanently Optimized and kept in balance as function of the Cause / Effect or Effect / Cause Ratio generating the Process Causal Structure Degree, the Quantitative Causal Indicator that shows how the Objective is Structured from an Entropic point of view and how much Cause or Effect Entropy is, in it.
Immediately following completion of the merger, existing holders of MaxLinear capital stock will hold approximately 65% and former Entropic stockholders will hold approximately 35% of MaxLinear's outstanding capital stock.
For more information, visit Entropic at http://www.
The transition from entropy measures of state to measures of entropic process involves two steps: (1) a shift from a sense-response perspective to that of input-throughput-output and (2) a refocus of entropic measurement from state orientation to process orientation.
The discrete quantity of entropic energy that a quantum of space assumes when it becomes electron depends on the features of the region in exam, on the situation existing in that particular region of ATPS (namely on the type of interaction, "potential" to which the region of ATPS is subjected).
Microsoft snapping up Entropic and the deal between IBM Corp and Nokia Oyj to work on speech R&D projects last week, shows that the industry's ideas about how to implement speech engines is changing.
These entropic forces become significant at scales of, roughly, a few tens of nanometers to a couple of microns.
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With so few homes wired with category 5 (CAT5) Ethernet, the ability to use simple-to-install solutions, like the Wi3 WiPNET, to turn existing home coax into a dynamic Ethernet home network, becomes ever more appealing," said Vinay Gokhale, senior vice president, Marketing and Business Development, Entropic.