Gay-Lussac's Law — FRCA Primary MCQ
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Correct answer: C — Pressure is proportional to absolute temperature at constant volume
Gay-Lussac's law: at constant volume the pressure of a fixed mass of gas is directly proportional to its absolute temperature (P ∝ T). This explains why gas cylinder pressure increases with temperature and why overfilled N2O cylinders can explode if heated.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment