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Charles' law and gas temperature — FRCA Primary MCQ

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ModeratePhysics and Clinical MeasurementCharles' law and gas temperatureFRCA Primary

A syringe containing a fixed amount of gas is warmed from a cold storeroom to theatre temperature while the plunger can move freely. What is the most appropriate explanation for the increased volume?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: A — Gas volume rises with absolute temperature

Charles' law describes the direct relationship between gas volume and absolute temperature at constant pressure. If the plunger moves freely, volume increases as temperature rises. Solubility and vapour pressure are different physical properties. Temperature correction matters in gas measurement and vaporiser design.

Reference: Primary FRCA physics texts; RCoA Primary FRCA Syllabus