Entropy of system, is a measure of the avaialability of its energy. A system
with high entropy can do less useful work. This concept was formally used to
define the second law of thermodynamics.
Specific Entropy
Specific entropy of a system is the entropy of the unit mass of the system and has the dimension of energy/
mass/temperature. The
SI unit of specific entropy is J/(Kg . K). Other units are: