GasGasGas - Anaesthetic Science for Anaesthesia! A not so brief jaunt with Oxygen, toxicity, exploding cylinders + heli-ox vs sulphur hexafluoride gas.
Jan 23, 2026
A lively tour of how medical oxygen is made, stored and piped through hospitals. Learn about cylinder types, safety systems and the physics behind vacuum‑insulated evaporators. Hear historical stories from early oxygen discovery to spacecraft lessons. Explore biological roles of oxygen, harms of too much oxygen, toxicity at pressure and when heliox or hyperbaric mixtures are used.
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Key Physical Properties Of Oxygen
- Oxygen boils at −183°C and has a critical temperature near −118°C; critical pressure to liquefy at that temperature is ~50 bar.
- These numbers explain why hospital vacuum-insulated evaporators must maintain very low temperatures and pressures.
Oxygen's Cellular Role
- Oxygen's physiological role is as the final electron acceptor in mitochondrial oxidative phosphorylation.
- It accepts electrons and protons to form water at the end of the electron transport chain.
Respiratory Harms From Excess Oxygen
- High inspired oxygen causes absorption atelectasis, mucosal drying, and parenchymal irritation leading to lung injury over time.
- Dry piped oxygen lacks humidity, which increases mucosal damage with prolonged high-flow use.
