... What it will be when the human lack of the oxygen? Oxygen shortage of the brain dizzy, headache, tinnitus, nausea ... , nervousness, breath hard, unconsciousness till die. Oxygen shortage of the skin: the weak metabolism of the ... pressure:40-60 KPaOxygen methodMolecular sieve pressure swing adsorption oxygen generator (PSA) air separation physical oxygenOther featuresTiming, total timing, ...