Definitions and translations for "entropy"

Definition of entropy

Pronunciation
Noun
1. Countable
1. Strictly thermodynamic entropy. A measure of the amount of energy in a physical system that cannot be used to do work.
The thermodynamic free energy is the amount of work that a thermodynamic system can perform; it is the internal energy of a system minus the amount of energy that cannot be used to perform work. That unusable energy is given by the entropy of a system multiplied by the temperature of the system. (Note that, for both Gibbs and Helmholtz free energies, temperature is assumed to be fixed, so entropy is effectively directly proportional to useless energy.)
2. A measure of the disorder present in a system.
Ludwig Boltzmann defined entropy as being directly proportional to the natural logarithm of the number of microstates yielding an equivalent thermodynamic macrostate (with the eponymous constant of proportionality). Assuming (by the fundamental postulate of statistical mechanics), that all microstates are equally probable, this means, on the one hand, that macrostates with higher entropy are more probable, and on the other hand, that for such macrostates, the quantity of information required to describe a particular one of its microstates will be higher. That is, the Shannon entropy of a macrostate would be directly proportional to the logarithm of the number of equivalent microstates (making it up). In other words, thermodynamic and informational entropies are rather compatible, which shouldn't be surprising since Claude Shannon derived the notation 'H' for information entropy from Boltzmann's H-theorem.
3. The capacity factor for thermal energy that is hidden with respect to temperature .
4. The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature.
2. A measure of the amount of information and noise present in a signal.
3. The tendency of a system that is left to itself to descend into chaos.
© Wordnet 3.1 & Wiktionary - Combined dictionary for best results.

English - English - entropy

Pronunciation
n. measure of the level of disorder in a system; amount of unavailable energy in a system (Thermodynamics)

English - Spanish - entropy

Pronunciation
s. entropía

English - French - entropy

Pronunciation
n. entropie, mesure du niveau de désordre dans un système, en thermodynamique, mesure de la quantité d'énergie non disponible pour le travail

English - German - entropy

Pronunciation
n. Entropie, mittlerer Informationsgehalt

English - Italian - entropy

Pronunciation
s. Antropia (misura dell'energia che non funziona)

English - Polish - entropy

Pronunciation
n. entropia

English - Portuguese - entropy

Pronunciation
s. entropia (medida do nível de desordem no sistema; na termodinâmica-medida da quantidade de energia que não está avaliável ao trabalho)

English - Russian - entropy

Pronunciation
с. энтропия

English - Turkish - entropy

Pronunciation
i. entropi, kullanılmaz enerji miktarı

English - Dutch - entropy

Pronunciation
zn. entropie, maat voor de wanorde in een systeem; hoeveelheid niet in voorraad zijnde energie in een systeem (Thermodynamica)

English - Greek - entropy

Pronunciation
(Lex**) εντροπία

English - Chinese - entropy

Pronunciation
(名) 熵

English - Chinese - entropy

Pronunciation
(名) 熵

English - Japanese - entropy

Pronunciation
(名) エントロピー, 物体の不確実性をはかる尺度(熱学力); 一様化; 無形化
Dictionary Extension
Share this page