Charles's Law — FRCA Primary MCQ
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Correct answer: B — Volume is directly proportional to absolute temperature at constant pressure
Charles's law: at constant pressure the volume of a fixed mass of gas is directly proportional to its absolute temperature (V ∝ T). Temperature must be in Kelvin (K = °C + 273). This explains gas expansion with heating.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment