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A piston cylinder is compressed with some pressure, what is the work done on the system?

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A piston cylinder is compressed with some pressure, what is the work done on the system?

(a) Positive

(b) Negative

(c) Zero

(d) Cannot say

I had been asked this question during an internship interview.

This intriguing question comes from Energy Types in portion Liquids and Gases in Equilibrium with Solids and Energy: Terminology, Concepts, and Units of Basic Chemical Engineering

1 Answer

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Right option is (a) Positive

The explanation is: Since pressure and displacement are positive their products are also positive, => work done on the system is positive.

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