tests with mixtures of he-o2 , ar-o2 , n2-o2 ( 80 % inert gas : 20 % o2 ) and pure oxygen demonstrated that gas solubility as well as supersaturation ( delta p ) , pressure ratio ( initial pressure : final pressure ) , and absolute pressure must be considered in setting tolerance limits for any decompression .
C0018880
he
C0017112
inert gas