Formula for dryness fraction x - Thermodynamics

Q.  If m1 and m2 are the masses of liquid and vapour respectively in a liquid-vapour mixture, then what is the formula for dryness fraction x?
- Published on 20 Aug 15

a. x = (m1 + m2) / m1
b. x = (m1 + m2) / m2
c. x = m1 / (m1 + m2)
d. x = m2 / (m1 + m2)

ANSWER: x = m2 / (m1 + m2)

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