What defines a closed system in thermodynamics?

Thermodynamics MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Thermodynamicsmechanical-engineering-mcqs › thermodynamics
Published
26 Jan 2019
Last updated
28 May 2026

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Explanation

A closed system is characterized by the fact that no mass crosses its boundary, although energy transfer is possible. This distinguishes it from open systems, where both mass and energy can cross boundaries, and isolated systems, where neither mass nor energy crosses.

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