Enthalpy of Vaporization (Liquid/Gas)

• DEFAULT: Watson Equation: (Output details)

  ln(H_vap/H_vap^o) = a₁ + åa_i ×T_r^i-2×ln(1-T_r) , where the summation is from i = 2 to nTerms

  T_r = T/T_c, T_c is the critical temperature, and H_vap^o = 1 kJ/mol

• Alternative 1: Yaws.VaporizationH (Output details)

  H_vap = A×{1 - ( T / T_c )}ⁿ

• Alternative 2: PPDS 12 (Output details)

  H_vap/(R×T_c) = a₁×t^1/3 + a₂×t^2/3 + a₃×t + a₄×t² + a₅×t⁶

  where t = 1 - T/T_c, T_c is the critical temperature, and R is the gas constant.