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SW_Entropy    Specific entropy of seawater

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USAGE:  s = SW_Entropy(T,S)

DESCRIPTION:
   Specific entropy of seawater at atmospheric pressure (0.1 MPa) using Eq. (46)
   given in [1] which best fit the data of [2]. The pure water specific
   entropy equation is a best fit to the data of [3]. 
   Values at temperature higher than the normal boiling temperature are
   calculated at the saturation pressure.

INPUT:  (all must have same dimensions)
   T = temperature [degree C] (ITS-90)
   S = salinity    [g/kg] (reference-composition salinity)

OUTPUT:
   s = specific entropy   [J/kg]

VALIDITY: 10 < T < 120 C, 0 < S < 120 g/kg
 
ACCURACY: 0.5
 
REFERENCES:
   [1] Sharqawy M. H., Lienhard J. H., and Zubair, S. M., Desalination and Water Treatment, 2010.
   [2] IAPWS release on the thermodynamic properties of seawater, 2008 
   [3] IAPWS release on the Thermodynamic properties of ordinary water substance, 1996. 
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