![]() ![]() Also, scientists have concluded that in a spontaneous process the entropy of process must increase. Moreover, the entropy of solid (particle are closely packed) is more in comparison to the gas (particles are free to move). The list of property identifiers needed in the calling arguments and instructions are available in the Thermophysical Function help. Entropy is a thermodynamic function that we use to measure uncertainty or disorder of a system. The JANAF table reference for entropy is based on the Third Law of Thermodynamics which references the entropy of all pure crystalline substances to zero at absolute zero temperature. However, all ideal gas substances (which have a chemical symbol name, e.g., N2, CO2, CH4) have enthalpy values corresponding to JANAF table references. The reference state upon which the value of enthalpy is based varies with the substance. Temperature must be the only argument, in addition to the substance name. The specific entropy of incompressible substances is a function of only temperature. Note also that for substance AirH2O (psychrometrics), the specific entropy returned by this function is the entropy of the air and water vapor mixture per unit mass of dry air. The remaining two can be any of the following: temperature (T), enthalpy (H), internal energy (U), relative humidity (R), humidity ratio (W), wetbulb (B), or dewpoint (D). One of these arguments must be total pressure (P). For all pure substances, the entropy function always requires two arguments, in addition to the substance name.įor AirH2O, three arguments are required. A main conclusion is that it is appropriate to view entropys symbol S as. The value and units of the returned value depends on the Unit System setting. The language of entropy is examined for consistency with its mathematics and. ENTROPY returns the specific entropy of a specified substance.
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