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 systems disorder that is a property of the systems 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 the measure of a systems thermal energy per unit temperature that is unavailable for doing useful workbecause work is obtained from ordered molecular motion the amount of entropy is also a measure of the molecular disorder or randomness of a system the concept of entropy provides deep insight into the direction of spontaneous change for many everyday phenomena. The law of entropy or the second law of thermodynamics along with the first law of thermodynamics comprise the most fundamental laws of physics entropy the subject of the second law and energy the subject of the first law and there relationship are fundamental to an understanding not just of physics but of biology psychology and culture. A measure of the amount of disorder in a system entropy increases as the systems temperature increases for example when an ice cube melts and becomes liquid the energy of the molecular bonds which formed the ice crystals is lost and the arrangement of the water molecules is more random or disordered than it was in the ice cube
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