Continuity is a property is defined in FCSys resistivity to axial compression or material storage during transport.
function zeta extends Modelica.Icons.Function; input Q.TemperatureAbsolute T = 298.15*U.K "Temperature" annotation( Dialog(__Dymola_label = "<html><i>T</i></html>")); input Q.VolumeSpecific v = 298.15*U.K/p0 "Specific volume" annotation( Dialog(__Dymola_label = "<html><i>v</i></html>")); output Q.Continuity zeta "Continuity" annotation( Dialog(__Dymola_label = "<html>ζ</html>")); end zeta;