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entropy
noun
en·tro·py ˈen-trə-pē 
plural entropies
1
thermodynamics : a measure of the unavailable energy in a closed thermodynamic system that is also usually considered to be a measure of the system's disorder, that is a property of the system's state, and that varies directly with any reversible change in heat in the system and inversely with the temperature of the system
broadly : the degree of disorder or uncertainty in a system
4
statistical mechanics : a factor or quantity that is a function of the physical state of a mechanical system and is equal to the logarithm of the probability for the occurrence of the particular molecular arrangement in that state
5
communication theory : a measure of the efficiency of a system (such as a code or a language) in transmitting information, being equal to the logarithm of the number of different messages that can be sent by selection from the same set of symbols and thus indicating the degree of initial uncertainty that can be resolved by any one message
Did you know?
With its Greek prefix en-, meaning "within", and the trop- root here meaning "change", entropy basically means "change within (a closed system)". The closed system we usually think of when speaking of entropy (especially if we're not physicists) is the entire universe. But entropy applies to closed systems of any size. Entropy is seen when the ice in a glass of water in a warm room melts—that is, as the temperature of everything in the room evens out. In a slightly different type of entropy, a drop of food coloring in that glass of water soon spreads out evenly. However, when a nonphysicist uses the word, he or she is usually trying to describe a large-scale collapse.
Example Sentences
Recent Examples on the Web Hawking's final paper revisited black hole entropy and the no-hair concept. 
Jennifer Ouellette, Ars Technica, 9 Sep. 2022 Sabine Hossenfelder on entropy: Entropy is a very anthropomorphic quantity. Geek's Guide To The Galaxy, WIRED, 9 Sep. 2022 The ambient entropy, which manifested here in the chaotic climate, the shriveling lake, the junk of human settlements laid waste, felt like the ultimate rebuke to our myopia. Henry Wismayer, Anchorage Daily News, 30 Aug. 2022 The ambient entropy, which manifested here in the chaotic climate, the shriveling lake, the junk of human settlements laid waste, felt like the ultimate rebuke to our myopia. Henry Wismayer, Washington Post, 29 Aug. 2022 In this case, the entropy is proportional to the three-dimensional volume of the box, not the area. Edgar Shaghoulian, Scientific American, 22 Aug. 2022 The key is to measure this entanglement entropy in the presence of multiple copies of the system. Ahmed Almheiri, Scientific American, 17 Aug. 2022 This extra bandwidth can be used for storage functions, such as compression, but it can also be used for other purposes, such as monitoring real time changes in entropy, heat of access and how data is changed and is changing. Tom Coughlin, Forbes, 13 June 2022 In 1961 physicist Rolf Landauer of IBM’s Thomas J. Watson Research Center in Yorktown Heights, N.Y., showed that conventional computing incurs an unavoidable cost in energy dissipation—basically, in the generation of heat and entropy. Philip Ball, Scientific American, 29 Mar. 2022 See More
Jennifer Ouellette, Ars Technica, 9 Sep. 2022 Sabine Hossenfelder on entropy: Entropy is a very anthropomorphic quantity. Geek's Guide To The Galaxy, WIRED, 9 Sep. 2022 The ambient entropy, which manifested here in the chaotic climate, the shriveling lake, the junk of human settlements laid waste, felt like the ultimate rebuke to our myopia. Henry Wismayer, Anchorage Daily News, 30 Aug. 2022 The ambient entropy, which manifested here in the chaotic climate, the shriveling lake, the junk of human settlements laid waste, felt like the ultimate rebuke to our myopia. Henry Wismayer, Washington Post, 29 Aug. 2022 In this case, the entropy is proportional to the three-dimensional volume of the box, not the area. Edgar Shaghoulian, Scientific American, 22 Aug. 2022 The key is to measure this entanglement entropy in the presence of multiple copies of the system. Ahmed Almheiri, Scientific American, 17 Aug. 2022 This extra bandwidth can be used for storage functions, such as compression, but it can also be used for other purposes, such as monitoring real time changes in entropy, heat of access and how data is changed and is changing. Tom Coughlin, Forbes, 13 June 2022 In 1961 physicist Rolf Landauer of IBM’s Thomas J. Watson Research Center in Yorktown Heights, N.Y., showed that conventional computing incurs an unavoidable cost in energy dissipation—basically, in the generation of heat and entropy. Philip Ball, Scientific American, 29 Mar. 2022 See More Word History
Etymology
International Scientific Vocabulary en- entry 2 + Greek tropē change, literally, turn, from trepein to turn
First Known Use
1867, in the meaning defined at sense 1
Time Traveler
The first known use of entropy was in 1867 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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