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Which of the following cannot be treated as a variable for degrees of freedom calculation?

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+1 vote
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Which of the following cannot be treated as a variable for degrees of freedom calculation?

(a) Temperature

(b) Pressure

(c) Volume

(d) Work

This question was posed to me in homework.

Question is taken from Solving Material and Energy Balances Using Process Simulators in chapter Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

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Best answer
The correct choice is (c) Volume

To elaborate: Since Volume is an extensive variable, it cannot be treated as a variable for degrees of freedom calculation.

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