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An average freediver needs 150ml of oxygen per minute while resting and 200-250ml of oxygen while swimming. Assuming the mammalian diving reflex, some divers can reduce their heartbeat significantly, down to 14 bpm, radically reducing overall body oxygen demands even down to 100ml per minute. The amount of dissolved oxygen in water varies, but ...
Water polo is an intensely aggressive sport, so fouls are very common and result in a free throw during which the player cannot shoot at the goal unless outside the 6 meter line. If a foul is called outside the 6 meter line, the player may either shoot (in one movement, ie without faking), pass or continue swimming with the ball.
Sea slugs respire through a gill (or ctenidium). Aquatic respiration is the process whereby an aquatic organism exchanges respiratory gases with water, obtaining oxygen from oxygen dissolved in water and excreting carbon dioxide and some other metabolic waste products into the water.
It is possible to split water into oxygen and hydrogen gas in zero gravity using sunlight, shows new study. Method of making oxygen from water in zero gravity raises hope for long-distance space ...
Although in-water recompression is widely regarded as risky, and to be avoided, there is increasing evidence that technical divers who surface and demonstrate mild DCS symptoms may often get back into the water and breathe pure oxygen at a depth of 20 feet (6.1 meters) for a period in an effort to alleviate the symptoms.
1952: Marconi and Siebe Gorman collaborated to produce an underwater television camera system. 1953: Some sport divers find how to make an aqualung regulator out of a Calor gas demand regulator, and spread this knowledge, thus bypassing the naval/industrial monopoly on making usable underwater breathing apparatus.
The Aqua-Lung is a self-contained open-circuit demand system, which means that breathing gas is provided from high-pressure storage carried by to the diver on demand, when the diver inhales and reduces the pressure in the supply hose, subsequently the flow is shut off when not required.
In the case of underwater diving and compressed air work, this mostly involves ambient pressures greater than the local surface pressure—but astronauts, high altitude mountaineers, and occupants of unpressurised aircraft, are exposed to ambient pressures less than standard sea level atmospheric pressure.