2 a the degradation of the matter and energy in the universe to an ultimate state of inert uniformity entropy is the general trend of the universe toward death and disorder james r newman. Information entropy is the average rate at which information is produced by a stochastic source of data the measure of information entropy associated with each possible data value is the negative logarithm of the probability mass function for the value when the data source produces a low probability value ie when a low probability event occurs the event carries more . 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. 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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