Values for the fugacity of H2O were extrapolated from 1,000° to 1,300° C in the 1,000 to 10,000 bar pressure region. A polynomial equation describing the extrapolated data is incorporated into a FORTRAN IV program which may be used to calculate the fugacity and also the free energy of H2O at any P, T point in the region 300 to 1,300° C, 500 to 10,000 bars.

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