Lever rule

Formula for determining the mole or mass fraction of phases in a binary phase diagram

In chemistry, the lever rule is a formula used to determine the mole fraction (xi) or the mass fraction (wi) of each phase of a binary equilibrium phase diagram. It can be used to determine the fraction of liquid and solid phases for a given binary composition and temperature that is between the liquidus and solidus line.

This keyword could refer to multiple things. Here are some suggestions: