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ln(p/p°) = ln(pc/p°) + Tc/T ×(a1×τ + a2×τ1.5 + a3×τ2.5 + a4×τ5)
ln(p/p°) = a1 + a2/T + a3×ln(T) + a4×T + a5×T2 + a6/T2 + a7×T6 + a8/T4
where p° = 1 kPa, pc = critical pressure and τ = 1 - T/Tc
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