The lever rule is a tool used to determine weight percentages of each phase of a binary equilibrium phase diagram.
It is used to determine the percent weight of liquid and solid phases
for a given binary composition and temperature that is between the liquidus and solidus.
Lever rule is employed to obtain relative amounts of co-existing phases as a binary system. This rule is not applicable at eutectic or peritectic points as three phases exist in equilibrium at these temperatures.
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