![]() ![]() It is a measure of how organized or disorganized energy is in a system of atoms or molecules. Gen Chem. Thermodynamic entropy is part of the science of heat energy. Entropy is a measure of the number of possible ways that the energy of a system can be distributed. Entropy is then a measure of how much energy cannot be converted to work, given these conditions.Information entropy, which is a measure of information communicated by systems that are affected by data noise.The meaning of entropy is different in different fields. These ideas are now used in information theory, statistical mechanics, chemistry and other areas of study.Įntropy is simply a quantitative measure of what the second law of thermodynamics describes: the spreading of energy until it is evenly spread. ![]() Some very useful mathematical ideas about probability calculations emerged from the study of entropy. The word entropy came from the study of heat and energy in the period 1850 to 1900. A diversity index is a quantitative measure that reflects how many different types (such as species) there are in a dataset (a community), and that can simultaneously take into account the phylogenetic relations among the individuals distributed among those types, such as richness, divergence or evenness. A law of physics says that it takes work to make the entropy of an object or system smaller without work, entropy can never become smaller – you could say that everything slowly goes to disorder (higher entropy). The higher the entropy of an object, the more uncertain we are about the states of the atoms making up that object because there are more states to decide from. In this sense, entropy is a measure of uncertainty or randomness. Entropy is also a measure of the number of possible arrangements the atoms in a system can have. Send us feedback about these examples.The entropy of an object is a measure of the amount of energy which is unavailable to do work. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'entropy.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Sebastian Smee, Washington Post, After seven years in the Hammerskins, exhaustion and entropy were setting in. ![]() 2022 Succumbing to something closer to entropy than evolution, the watercolor starts to puddle and bruise. Ahmed Almheiri, Scientific American, 17 Aug. 2021 This is the island formula for the entanglement entropy of the Hawking radiation. Conor Feehly, Discover Magazine, 3 Nov. James Riordon, Scientific American, In short, the tendency for systems to move from low entropy to high entropy, the particular spacetime conditions of our solar system and the indeterminacy of the future combine to create our particular conception of time. Therefore, in principle, the greater the entropy, the better a password, at least when it comes to resisting brute force attacks. We express it in terms of bits if a password has n bits of entropy, an attacker needs at most 2 n guesses. James Riordon, Scientific American, The expansion allows the universe to smooth out, dissipating the entropy before collapsing again. This measure is known as password entropy. Quanta Magazine, That flaw is entropy, which builds up as a universe bounces. 2022 If the entropy of the system decreases, the entropy of the environment must increase such that the sum of the two entropies can only increase or stay the same, but never decrease. Jennifer Ouellette, Ars Technica, 2 Dec. Recent Examples on the Web Jacob Bekenstein realized in 1974 that black holes also have entropy.
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