Slope of the tangent at the saturated vapour pressure at any temperature
function DerivativeSaturatedVapourPressure input Real TSat(unit = "degC", displayUnit = "degC", nominal = 20) "Saturation temperature"; output Modelica.Units.SI.PressureCoefficient dpSat_dT(displayUnit = "Pa/K", nominal = 1000) "Slope of saturation pressure"; end DerivativeSaturatedVapourPressure;