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A piston cylinder expands with some pressure, what is the work done by the system?

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A piston cylinder expands with some pressure, what is the work done by the system?

(a) Positive

(b) Negative

(c) Zero

(d) Cannot Say

I have been asked this question in an interview for job.

I would like to ask this question from Energy Types in section Liquids and Gases in Equilibrium with Solids and Energy: Terminology, Concepts, and Units of Basic Chemical Engineering

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Correct option is (a) Positive

The best I can explain: Since direction of displacement and force are same, work done will be positive.

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