*************************************************************************************
*                Compilation of Experimental Data Used to Develop                   *
*                                                                                   *
*   The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water   *
*                    Substance for General and Scientific Use                       *
*************************************************************************************

                         These data were compiled at the
                            Chair of Thermodynamics
                            Ruhr-Universitaet Bochum
                            D-44780 Bochum, Germany
                           
The compilation is based on the information given in the article

Wagner, W. and Pru, A., The IAPWS Formulation 1995 for the Thermodynamic Properties
of Ordinary Water Substance for General and Scientific Use. J. Phys. Chem. Ref. Data
31 (2002), 387-535.

The folders in the directory contain the experimental data for different thermodynamic
properties which were used to develop the IAPWS-95 formulation. Only the selected
points are listed (see Tables 4.1 to 4.9 of article on IAPWS-95 mentioned above).


The following properties are included (see Table 5.4 of the article on IAPWS-95):

Type of data                                  Referred to as     For details see
--------------------------------------------------------------------------------
Thermal properties                                p-rho-T          Table 4.4
Vapour pressure                                   psigma           Table 4.1
Saturated liquid density                          dl               Table 4.1
Saturated vapour density                          dv               Table 4.1
Isochoric heat capacity                           cv               Table 4.6
Isobaric heat capacity                            cp               Table 4.8
Isobaric heat capacity of the saturated liquid    cpl              Table 4.3
Isobaric heat capacity of the saturated vapour    cpv              Table 4.3
Speed of sound                                    w                Table 4.5
Speed of sound of the saturated liquid            wl               Table 4.3
Speed of sound of the saturated vapour            wv               Table 4.3
Enthalpy differences                              dh               Table 4.9
Joule-Thomson coefficient                         jt               Table 4.9
Isothermal throttling coefficient                 dt               Table 4.9


In some directories are subfolders called "comparison". They contain data which 
were only available after the development of the IAPWS-95 formulation had been 
finished. These data were used to check how IAPWS-95 represents these data of the 
corresponding thermodynamic properties.

Calculated values of different properties as listed in Table 5.4 were not included
in this compilation.

In only a few datasets there are small differences between the number of data given 
in the tables mentioned above and the number of data available in the datafiles.
These datasets are listed below.

Type of data   Reference               Number of data        Number of data
                                       given in the table    available on CD
------------------------------------------------------------------------------------
p-rho-T        Masui et al. (1995)            2                    19 (see footnote)
dl             Osborne et al. (1937)         29                    28
cv             Magee et al. (1998)          278                   272
------------------------------------------------------------------------------------
Footnote: Calculated data from an equation given in the reference.


According to the data used when developing IAPWS-95 the number of significant figures
given for temperatures of the saturated properties and of the properties in the 
homogeneous region are different.