WTT User's Guide
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Density (saturated liquid)

Mass density ρ of a liquid in equilibrium with a gas phase, as a function of temperature T and in units of kg/m³.

Douslin

ρ_sat = ρ_c + a₀×τ^0.35 + ∑a_iTⁱ, i ∈ [1, n_terms - 1]

PolynomialDensity

ρ = ∑a_iTⁱ, i ∈ [0, n_terms - 1]

REFPROP

where ρ_c = critical density and τ = 1 - T/T_c

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