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Engineers use the specific entropy in thermodynamic analysis more than the entropy itself. Greater the temperature, grater the agitation.The entropy can be made into an intensive, or specific, variable by dividing by the mass. Now recall that temperature is actually a measure of molecular (or particle) agitation. In layman's term it is related to the degree of disorder introduced to the system, relative to its initial disorder. Entropy change is related to reversibility.

The greater the disorder of the particles the more positive the change in entropy (S) will be. Convert from unit: To unit: BTU/pound ☏ BTU/pound °R calorie/gram ☌ CHU/pound ☌ joule/kilogram K joule/kilogram ☌ kilocalorie/kilogram ☌ kilojoule/kilogram K kilojoule/kilogram ☌.Entropy, also represented as the symbol S, is the measure of disorder or randomness of the particles in a thermodynamic system. It equals to the total entropy (S) divided by the total mass (m).Entropy Conversions.

Continue Reading.In general, specific entropy is a property of a substance, like pressure, temperature, and volume, but it cannot be measured directly. When calculating a change in entropy during a chemical reaction, one has to d. Because entropy tells so much about the usefulness of an amount of heat transferred in performing work, the steam tables include values of specific entropy (s = S/m) as part of the information tabulated.The SI unit of entropy is Joules per degree Kelvin (J/K).

Stacey, Nuclear Reactor Physics, John Wiley & Sons, 2001, ISBN: 0- 471-39127-1. Baratta, Introduction to Nuclear Engineering, 3d ed., Prentice-Hall, 2001, ISBN: 8-1. Lamarsh, Introduction to Nuclear Reactor Theory, 2nd ed., Addison-Wesley, Reading, MA (1983). The fact that the absolute value of specific entropy is unknown is not a problem, however, because it is the change in specific entropy (∆s) and not the absolute value that is important in practical problems. For example, the specific entropy of water or steam is given using the reference that the specific entropy of water is zero at 0.01☌ and normal atmospheric pressure, where s = 0.00 kJ/kg.

Miller, Computational Methods of Neutron Transport, American Nuclear Society, 1993, ISBN: 2-4. Hetrick, Dynamics of Nuclear Reactors, American Nuclear Society, 1993, ISBN: 3-2.  Neuhold, Introductory Nuclear Reactor Dynamics, American Nuclear Society, 1985, ISBN: 9-4. Bezella, Introductory Nuclear Reactor Statics, American Nuclear Society, Revised edition (1989), 1989, ISBN: 3-2.