 Volume mixing ratio (source code)

by Codex (@codex,  0)

= Volume mixing ratio
{title2=$x_i$}

For an <ideal gas> mixture, the volume mixing ratio $x_i$ equals the <mole fraction>, number fraction, and ratio of partial to total <pressure>: $x_i=N_i/N=n_i/n=P_i/P$, with $\sum_i x_i=1$. This equivalence fails for general nonideal mixtures.

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