Vapour pressure — FRCA Primary MCQ

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HardPhysicsVapour pressureFRCA Primary

Vapour above a volatile liquid reaches a characteristic pressure at theatre temperature. What is the most important safety consideration?

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

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Correct answer: E — Saturated vapour pressure

SVP is the equilibrium vapour pressure above a liquid. Residual non-depolarising neuromuscular block is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Pin index system is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Mapleson A is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Top of the bobbin gives calibrated flow is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA physics and measurement, the safest answer is the one that follows the underlying physical principle and the limitations of the device.

Reference: Davis and Kenny Basic Physics and Measurement in Anaesthesia; RCoA Primary FRCA syllabus