Dalton's law — FRCA Primary MCQ
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Correct answer: C — Dalton's law
Total pressure is the sum of component partial pressures. Boyle's law is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Lower gas density reduces turbulent resistance is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Laplace's law is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Charles' law 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