![]() ![]() Its SI unit is J/Kmol and CGS unit is cal/Kmol. ![]() Mathematically this can be represented as - \. Sum of two is called the entropy change of the universe. The total change in entropy of an isolated system and change in entropy of the surrounding is always equal. Hence, it is said to be a state function. If the process takes place over a range of temperature, the quantity can be evaluated by adding bits of entropies at various temperatures. Thus, entropy has the units of energy unit per Kelvin, J K -1. Hence, we call it to be an extensive property.Ĭhanges in the value of entropy depend on changes in quantities such as temperature, volume, pressure and number of moles of substance present in the system. Entropy is the amount of energy transferred divided by the temperature at which the process takes place. Value of entropy is dependent upon the amount of substance present in the system. It is a thermodynamic function represented by ‘S’. In simpler words, it is the tendency of the universe towards disorder.Įntropy is defined as the measure of randomness or disorder of a thermodynamic system. Some current approaches regarding “information entropy” are either misleading or truly fallacious, if they do not include explicit statements about the essential inclusion of molecular kinetic energy in their treatment of chemical reactions.Hint: In thermodynamics, entropy is generally referred to as a measure of spontaneous changes that occur in a system. Thus, “information probability” is only one of the two requisites for entropy change.
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