What is two-property rule? - Thermodynamics

Q.  The two-property rule statement consists that ____.
- Published on 21 Aug 15

a. to fix state of pure substance of a given mass, the system should be in equilibrium
b. to fix state of pure substance of a given mass, any two independent intensive properties of the substance should be specified
c. both a. and b. conditions should be satisfied
d. none of the above

ANSWER: both a. and b. conditions should be satisfied
 
The state of pure substance of a given mass can be fixed by specifying two independent intensive properties when the system is in equilibrium. Once any two properties of a pure substance is known then other properties can be calculated from available thermodynamic relations.

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