User:ChewBecca07

–French physiologist Paul Bert found nitrogen to be the cause of decompression sickness in 1878. Nitrogen is a mixture of gases, primarily nitrogen (78%) and oxygen (21%) along with other small amounts of gases. Our body does not use the nitrogen we breathe- we inhale it and exhale it. Being inert, nitrogen is unaltered in the respiratory process and, for all practical purposes, quantitatively obeys purely physical laws. A certain amount of nitrogen naturally pervades our tissues at all times. When diving, the increased pressure of depth causes additional nitrogen to be dissolved in our tissues. If the nitrogen loading is excessive, it can cause nitrogen narcosis during the dive, or if the ascent is too rapid, decompression sickness after you surface (or in extreme cases, as you approach the surface). In the early twentieth century, John Scott Haldane developed a quantitative model for nitrogen loading, and devised tables that set safe time limits for single dives and stage decompression schedules for dives that exceeded the limits. Credit for developing and introducing nitrox diving techniques for standard scuba goes to Dr. Morgan Wells. In 1992, NAUI officially endorsed nitrox training by NAUI instructors. Diving with nitrox allows divers to extend their bottom time and enjoy longer dives without having a required-decompression obligation stop. Another benefit of nitrox is the possibility of a shorter required surface interval. Another common use of nitrox in diving is simply as a safety margin. After diving with nitrox, many divers claim that they are physically less tired after a series of dives.

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