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 = exp(A)×{1 - ( T / T_c )}ⁿ

• Alternative 2: PPDS 12 (Output details)

  H_vap/(0.001×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.