Your sdi nitrox diver certification allows you to use nitrox mixtures whose oxygen content ranges as high as 40 percent (ean40).
The above statement is True.
What is a nitrox mixture?
Any mixture of nitrogen and oxygen gases, excluding trace gases, is referred to as nitrox. Included in this is atmospheric air, which consists largely of argon but also contains around 21% oxygen, 78% nitrogen, and 1% other gases.
Nitrox is a tool that can be useful when used properly, but deadly when not, just like every other piece of equipment and information a diver carries. With everything else being equal and the gas supply permitting, the nitrox has the goal to extend your no-stop dive time so that you can have longer dives and/or shorter surface intervals.
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