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SURFACETENSION [N/m, lbf/ft] returns the surface tension at the liquid-vapor interface of a saturated fluid.  The value and units of the returned value depend on the setting in the Unit System dialog.  This function requires only one argument, in addition to the fluid name, and that is the temperature.




$UnitSystem SI C kPa mass 

sigma_water=SURFACETENSION(Water, T=200 [C])

sigma_salt=SurfaceTension('Salt (45% NaNO3, 55% KNO3)', T=400 [C])



sigma_salt=0.1092 [N/m]

sigma_water=0.03767 [N/m]



Thermophysical Functions