![]() It has the dimension of energy divided by temperature, which has a unit of joules per kelvin (J K-1) in the International System of Units (or kg m2 s-2 K-1 in basic units). Entropy was discovered when it was noticed to be a quantity that behaves as a function of state, as a consequence of the second law of thermodynamics.Įntropy is an extensive property. The concept of entropy has been found to be generally useful and has several other formulations. (If heat is transferred out the sign would be reversed giving a decrease in entropy of the system.) The above definition is sometimes called the macroscopic definition of entropy because it can be used without regard to any microscopic description of the contents of a system. ![]() Where T is the absolute temperature of the system, dividing an incremental reversible transfer of heat into that system (dQ).
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