WTT User's Guide
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Viscosity (Saturated Liquid)

The viscosity η of a liquid in equilibrium with its vapor, as a function of temperature T and in units of Pa×s.

ViscosityL

ln(η/η°) = ∑a_i/Tⁱ, i ∈ [0, n_terms - 1]

PPDS9

ln(η/η°) = a₁×X^1/3 + a₂×X^4/3 + ln(a₅)

X = (a₃ - T)/(T - a₄)

REFPROP

where η° = 1 Pa×s

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