Assertion: oxygen's pressure | /r/HasProperty | limited to safe levels
Facets:
value: relatively
type: DEGREE
Source sentences:
text: Oxygen supply to divers in decompression chambers is preferably through a built-in breathing system, which uses an oxygen mask plumbed into supply and exhaust hoses which supply oxygen from outside the chamber, and discharge the exhaled oxygen-rich gas outside the chamber, using a system equivalent to two demand valves, one upstream of the diver, to supply oxygen on demand, and the other downstream, to exhaust exhaled gas on demand, so that the oxygen partial pressure in the chamber is limited to relatively safe levels.