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Dimensionless Helmholtz free energy

Values for calculation

$ n $
$ δ $
$ I $
$ τ $
$ J $
$ \text{Region} $

Calculation

Dimensionless Helmholtz free energy

$\text{if }\ \text{Region}= 3$
$$φ=\left(n\right)[1]\cdot\ln{δ}+\sum_{i=2}^{40}{n[i]\cdot δ^{I[i]}\cdot τ^{J[i]}}$$
$\text{else}$
$$φ=0$$