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ln(p/p°) = ln(pc/p°) + Tc/T ×(a1×τ + a2×τ1.5 + a3×τ2.5 + a4×τ5)
where p° = 1 kPa, pc = critical pressure and τ = 1 - T/Tc
The basis for this functional form is discussed in [28] and [29].
Please note that the equations described above are expressed in terms of vapor pressure and not in the necessary inverted form. The parameters for a given fit can be found in the model summary for the associated phase boundary pressure contour.
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