Lever rule

Using the lever rule one can determine quantitatively the relative composition of a mixture in a two-phase region in a phase diagram. The distances l from the mixture point along a horizontal tie line to both phase boundaries give the composition:^[1]

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n_αl_α = n_βl_β

n_α represents the amount of phase α and n_β represents the amount of phase β.

1. ^ Peter Atkins, Julio de Paula, Atkins’ Physical Chemistry, 7th edition, Oxford University Press, ISBN 0-19-879285-9