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Table 2 Temperature and humidity of ambient air and of the medical gas under various conditions

From: Effect of a heated humidifier during continuous positive airway pressure delivered by a helmet

  Temperature (°C) Absolute humidity (mgH2O/l) Relative humidity (%)
Ambient air 20–22 9–12 50–60
Pipeline medical gases 20–21 3–4 18–25
Ventilator medical gases 22–26 3–4 16–19