![]() ![]() ![]() Mixed-gas diving can also be beneficial in improving decompression and avoiding oxygen toxicity. The main incentive to dive with "non-air" gas mixtures is to avoid nitrogen narcosis. The term "mixed-gas diving" refers to any activity in which the diver breathes a mixture other than air or nitrox. These tables list the maximum safe amount of time that a diver can stay underwater at a certain depth. Due to this potentially fatal hazard, divers using nitrox must adhere to special dive tables. Under these circumstances, a diver can experience an epileptic-like seizure, which may lead to drowning. This comes about when oxygen is inhaled in high concentrations for an extended period of time this occurs primarily when a diver exceeds the recreational limits for depth. While diving with nitrox has definite benefits, it also has clearly associated risks. While an increase of 12 to 16 percent oxygen by volume may not seem drastic, it allows divers to significantly extend their bottom time, and decreases their risk of developing DCS. This differs significantly from compressed air, which contains approximately 21 percent oxygen by volume. The two most commonly used nitrogen-oxygen mixtures contain 32 percent and 36 percent oxygen by volume. In the context of technical diving, nitox is a mixture containing more oxygen than air. Nitrox is a generic term that can be used to describe any gaseous mixture of nitrogen and oxygen. In an effort to reduce the ill effects of nitrogen on divers, nitrox was developed. Both of these can prove fatal to a diver. With a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis (a condition resembling alcoholic intoxication) at deeper depths and decompression sickness (DCS). Nevertheless, air is not the "ideal" breathing mixture for diving. Its main advantage is that it is readily available and relatively inexpensive to compress into cylinders. People have used compressed air as their breathing medium since the advent of diving in the 1950s. The formation of these bubbles leads to an extremely painful condition known as Decompression Sickness (DCS), more commonly known as the "bends," which can cause paralysis and even death. If an individual exceeds the limits of time and/or depth for recreational diving, and/or ascends too quickly, large bubbles can form in the tissues, joints, and bloodstream. ![]() Decompression stops are necessary to allow gases that have accumulated in the diver's tissues (primarily nitrogen) to be released in a slow and controlled manner. Technical diving almost always requires one or more mandatory decompression "stops" upon ascent, during which the diver may change breathing gas mixes at least once. Brett watches over Tom and Jill while they perform their decompression obligation prior to surfacing. Tom and Brett on the deco bar at 20 foot depth. Diversity, Equity, Inclusion, and Accessibility.Used to create the user's profile of interests. Used to check when advertisements appear. Used to store your preferred settings and other information. Used to identify the user when the user clicks on an advertisement. Used to optimise Google DoubleClick advertising in order to provide users with relevant advertisements. Our analytical cookies measure pseudonymously how often our website content is used and how long such content is used for. Our priority is to constantly improve the performance and user-friendliness of our website for you. ![]()
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