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VIE Liquid O2 -183°C — FRCA Primary MCQ

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ModeratePhysics & Clinical MeasurementVIE Liquid O2 -183°CFRCA Primary

Regarding the vacuum-insulated evaporator (VIE) for hospital oxygen supply at what temperature is liquid oxygen stored?

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

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Correct answer: A — −183°C

Liquid O2 in the VIE is stored at approximately -183°C (boiling point of O2) at a pressure of 7-10 bar in a double-walled vacuum-insulated container. It provides the most economical bulk oxygen supply. Safety features include: pressure relief valves / non-return valves / and location ≥5 m from buildings (fire risk).

Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment