T-MATS: PT2S Library Block
This block emperically calculates entropy (S) from pressure (P), temperature (T) and fuel to air ratio (FAR). Temperature and Pressure inputs must be of the same type, static or total (ie. using total temperature with static pressure will produce an incorrect entropy).

PT2S Inputs:

PT2S Input	Description
T	Temperature [degR]
P	Pressure [psia]
FAR	Fuel to Air Ratio[frac]

PT2S Outputs:

PT2S Output	Description
S	Entropy [BTU/(lbm*degR)]