Correlation 48 (Wagner – Second Form)

The following table lists the identification numbers of this correlation with respect to some well-known sources of thermodynamic data.

The equation has the following form:

where

P is the temperature-dependent property that you want to calculate

You must use at least 1 coefficient with this correlation.

While this correlation shows the calculation for the natural logarithm (ln) of the temperature-dependent property, the software calculates either the natural logarithm or the logarithm base 10 (log) of the temperature-dependent property based on your Log Basis selection in AVEVA Thermodynamic Data Manager (TDM). The default logarithm basis is the natural logarithm.

You can use up to 4 coefficients with this correlation.

You can use any temperature unit of measure (UOM) when you input data for this correlation. However, AVEVA Thermodynamic Data Manager converts temperatures to Kelvin (K) and the critical pressure, PC, to the UOMs that you select for the temperature-dependent property before it calculates the property value.

Usage

We recommend that you use this correlation to calculate only the following property:

• Vapor Pressure

References

1. Wagner, W.,"New vapour pressure measurements for argon and nitrogen and a new method for establishing rational vapour pressure equations." Cryogenics 1973, 13, 470-482.