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Entropy - Wikipedia

In statistical mechanics, entropy is an extensive property of a thermodynamic system. It quantifies the number Ω of microscopic configurations (known as microstates) that are consistent with the macroscopic quantities that characterize the system (such as its volume, pressure and temperature)..

Entropy | Definition of Entropy by Merriam-Webster

Entropy definition is - 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..

entropy | Definition and Equation | Britannica

Entropy, the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system..

What Is Entropy? - ThoughtCo

Entropy is the measure of the disorder of a system. It is an extensive propertyof a thermodynamic system, which means its value changes depending on the amount of matterthat is present. In equations, entropy is usually denoted by the letter S and has unitsof joules per kelvin (J⋅K−1) or kg⋅m2⋅s−2⋅K−1..

Entropy | Definition of Entropy at Dictionary.com

(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..

What is Entropy? - Universe Today

What is Entropy? Perhaps there’s no better way to understand entropy than to grasp the second law of thermodynamics, and vice versa. This law states that the entropy of an isolated system that is....