Divers use 21% Oxygen and 79% nitrogen while underwater. It results in the same exact air we breath on the surface.
water proof ones
Some diver use nitrogen to stay underwater for longer but usually compressed air is usedfor those who don't use nitrogen
In a tenths situation is when sky divers use decimals.
What kind of companies use natural gas in California?
The use of an oxygen analyzer would be advised. Most nitrox and technical divers have one.
unleaded
Nitrogen
rough
Diver Suits
In recreational diving, most divers use compressed air (as in the normal air we breather at the surface). Some divers are also trained to use special gas mixes called Nitrox which have a higher oxygen content and lower Nitrogen. Professional (or commerical) divers tend to use more advance mixes such as Heliox or Trimix which combine Oxygen, Nitrogen and Helium.
Any inert gas you are breathing.
Hydrogen Gas.