Name  Type  Description 
ViscosityTemperatureDerivative 
P_SINGLEVALUE
/
IfcReal

 Viscosity Temperature Derivative  Viscosity temperature derivative. 

MoistureCapacityThermalGradient 
P_SINGLEVALUE
/
IfcReal

 Moisture Capacity Thermal Gradient  Thermal gradient coefficient for moisture capacity. Based on water vapor density. 

ThermalConductivityTemperatureDerivative 
P_SINGLEVALUE
/
IfcReal

 Thermal Conductivity Temperature Derivative  Thermal conductivity temperature derivative. 

SpecificHeatTemperatureDerivative 
P_SINGLEVALUE
/
IfcReal

 Specific Heat Temperature Derivative  Specific heat temperature derivative. 

VisibleRefractionIndex 
P_SINGLEVALUE
/
IfcReal

 Visible Refraction Index  Index of refraction (visible) defines the "bending" of the sola! r ray in the visible spectrum when it passes from one medium into another. 

SolarRefractionIndex 
P_SINGLEVALUE
/
IfcReal

 Solar Refraction Index  Index of refraction (solar) defines the "bending" of the solar ray when it passes from one medium into another. 

GasPressure 
P_SINGLEVALUE
/
IfcPressureMeasure

 Gas Pressure  Fill pressure (e.g. for betweenpane gas fills): the pressure exerted by a mass of gas confined in a constant volume. 
