C_p^o(Ideal Gas)

• DEFAULT 1: Wilhoit Equation
  C_p^o / R = a₀ + (a₁ /T ²) × exp( -a₂ /T ) + a₃ × y² + {a₄ - a₅ /(T - a₇)²} × y ⁸
  where    y = (T - a₇)/(T + a₆)    and R is the gas constant.
  See Thermodynamics of Organic Compounds in the Gas State (Volumes I and II) by M. Frenkel, G. J. Kabo, K. N. Marsh, G. N. Roganov, and R. C. Wilhoit. Publsihed by the Thermodynamics Research Center (TRC), College Station: TX. 1994.

• DEFAULT 2: PolynomialHC: (Output details)
  C_p^o = å a_i× T ⁱ, where the summation is from i = 0 to nTerms - 1.

• Alternative 1: Yaws.PolynomialExpansion (Output details)
  C_p^o = å a_i× T ⁱ, where the summation is from i = 0 to nTerms - 1.

• Alternative 2: AlyLee (which is also DIPPR 107) (Output details)
  C_p^o = a + b×{(c/T)/sinh(c/T)}² + d×{(e/T)/cosh(e/T)}²

• Alternative 3: PPDS2 (Output details)
  C_p^o/R = C_low + (C_low - C_¥)×y² ×{1 + (y - 1) å(a_i × y_i)} ; where the summation is from i = 0 to 4.
  C_low and C_¥ are equation constants, R is the gas constant, and y = T / (T + T_S), where T_S is a constant.

• Alternative 4: Helmholtz (Output details)
  C_p^o/R = 1 + t - {åa_i×n_i×(n_i - 1)×t^n_i}_{(ni¹ 0 or 1)} + åb_i×(c_i×t)²×exp(c_i×t) / {exp(c_i×t) - 1}²;
  where t = T_c/T, T_c = the critical temperature, R is the gas constant, and the summations are from i = 1 to nTerms.

• Alternative 5: Yaws.HighIG (Output details) for high-temperature applications
  C_p^o = å a_i× T ^n_i , where the summation is from i = 1 to 4.