WTT User's Guide
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Surface Tension

Surface tension σ of a liquid in equilibrium with its vapor, as a function of temperature T and in units of N/m.

ISTExpansion

σ = ∑a_iτⁱ, i ∈ [1, n_terms]

Yaws.SurfaceTension

ln(σ/σ°) = A + nln(τ)

PPDS14

σ = a₀τ^a₁(1 + a₂τ)

REFPROP

where σ° = 1 N/m and τ = 1 - T/T_c

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