Why is Lever rule used?

Q.  The rule used to determine composition of various phases in a phase diagram is _____
- Published on 11 Sep 15

a. Gibb's phase rule
b. Lever rule
c. Both a. and b.
d. None of the above

ANSWER: Lever rule

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    Discussion

  • Sravanthi   -Posted on 20 Nov 15
    - The rule used to determine composition of various phases in a phase diagram is Lever rule.

    - This rule is used to determine weight percentage of each phase of a binary equilibrium phase diagram.



    - The relation between arms of lever and amount of phases according to Lever's rule is given as:

    - (Amount of solid) / (Amount of liquid) = Arm AB / Arm BC

    - Therefore, by considering weight at points A, B and B, C. The amount of liquid in percentage can be calculated by substituting the values of weight.

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