What is the lever rule in a Txy diagram

  1. I dont understand what the lever rule is on a Txy or Pxy diagram

    I know that when you are given a mole compostition of said component, you go up to whatever temp or pressure is given to see the compositions.
    but, if it is inside the 2 lines of vapor and liquid, you use the lever rule.
    can someone plz explain this? thank you
  2. jcsd
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