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Enthalpy of vaporization

Enthaply difference Δh_vap between a condensed phase (e.g. crystal, liquid) and the vapor at equilibrium with it, as a function of temperature T and in units of kJ/mol.

Watson

ln(Δh_vap/Δh_vap°) = b + ∑a_iT_rⁱln(1 - T_r), i ∈ [0, n_terms - 2]

REFPROP

where Δh_vap° = 1 kJ/mol and T_r = T/T_c

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Enthalpy of vaporization

Watson

REFPROP