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There are various mixes of gases which can be used in diving tanks. The most commonly used one for recreational diving is normal air which consists of 80% nitrogen and 20% oxygen (and a small amount of carbon dioxide, argon and other gases)

Sometimes the proportion of nitrogen - oxygen is change as follows:

Air (80% nitrogen and 20% oxygen)

Nitrox-28 (72% nitrogen and 28% oxygen)

Nitrox-30 (70% nitrogen and 30% oxygen)

Nitrox-32 (68% nitrogen and 32% oxygen)

Nitrox-34 (66% nitrogen and 34% oxygen)

These are just examples but different mixes can be made

You can also use mixes of nitrogen, oxygen and helium. this mix is called trimix.

Hope that helps

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17y ago

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