On Nov 14, 2:33 pm, Stefan wrote:
Robert M. Gary schrieb:

Do Scuba guys use O2? I thought they used air?

Of course they don't breath pure O2. However, some "advanced" divers
sometimes don't just use compressed air, but their own mixture. Even
more advanced divers sometimes use apparati which mix pure O2 with
whatever they want on the fly while under water.

So a specialized scuba shop might be able to provide you with pure O2.

Enriched Air Nitrox (32 to 36%O2) has become more and common in
scuba diving. Divers at any level can get training to use Nitrox
since Nitrox certification card is required to get Nitrox filled
tanks. We got Nitrox certified at the same time with our Open water
(entry level) scuba dving training and prefer to dive with Nitrox as
much as possible. Diving with Nitrox especially in multiple days
repetitive diving trip makes a huge difference in fatigue level, and
of course increases safety margin with regards to getting the bend.
Nitrox is available in many if not all dive shops. Since the shop
does their own mixing of air and O2, they do have pure O2 tanks to
fill aviation bottles.

Hai Longworth