Humidification in a modified circle system.
D000776:Anesthesiology / Q000295:instrumentation*; D002118:Calcium; D002245:Carbon Dioxide; D006801:Humans; D006813:Humidity; D012972:Sodium Hydroxide; D014835:Volatilization; D014867:Water
D014867:Water; D002245:Carbon Dioxide; D012972:Sodium Hydroxide; D002118:Calcium