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actually we dont mix nitrogen nor oxygen we use normal fresh air.

The normal Air is 21% oxygen + 78% Nitrogen + 1% others.

As humans more oxygen can be toxic for us especially underwater.

However, in some cases "Like with Nitrox" we add more oxygen to make the percentage up to 40%, but this require specific training and certification.

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Q: Why do you mix nitrogen with air when scuba diving?
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