For an ideal gas, this function is independent of pressure (although pressure remains as a valid input).
function h
import FCSys.Utilities.Polynomial;
extends Modelica.Icons.Function;
input Q.TemperatureAbsolute T = 298.15*U.K "Temperature" annotation(
Dialog(__Dymola_label = "<html><i>T</i></html>"));
input Q.PressureAbsolute p = p0 "Pressure" annotation(
Dialog(__Dymola_label = "<html><i>p</i></html>"));
output Q.Potential h "Specific enthalpy" annotation(
Dialog(__Dymola_label = "<html><i>h</i></html>"));
end h;