| hvl_p_derDerivative function for the specific enthalpy along the phase boundary |  | 
| p | Type: Pressure (Pa) Description: Pressure | 
|---|---|
| bpro | Type: IF97PhaseBoundaryProperties Description: Property record | 
| p_der | Type: Real Description: Derivative of pressure | 
| h_der | Type: Real Description: Time derivative of specific enthalpy along the phase boundary | 
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