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Answer: A thermodynamic system is a definite quantity of matter (or a region of space) enclosed by a boundary, chosen for study, which can exchange energy (heat or work) with its surroundings and is described by state variables such as P, V and T.

Everything outside the boundary is the surroundings, e.g. a gas enclosed in a cylinder with a piston.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report
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