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It is generally thought that in the real world they would have to be unwieldily bulky because of the massive amount of water that would have to be processed to extract enough oxygen to supply an active diver, as an alternative to a Scuba Set . But see Like-A-Fish for an ongoing attempt to develop such a system in the real world. According to this link , "In sea water, the average amount of oxygen is 7 ppm". Roughly, this means that 1,000,000 kg (1000 metric tons, a 10 m×10 m×10 m cube) of sea water holds 7 kg or roughly 5,000 litres (7 kg/( 1.42 Kg/m³ )) of oxygen at atmospheric pressure. The most economic diving equipment for oxygen consumption is a fully closed-circuit Rebreather , where divers typically consume 1 litre of oxygen per minute. So, the diver would need to pass at least 200 litres (200 kg) per minute (3.3 liters = about 0.12 ft³ per second) of normally oxygenated sea water through 100% efficient Gill s to stay alive, and the gill equipment would be unwieldily bulky. And it would not work in Anoxic water. Natural Gill s work because all or most animals with gills are Cold-blooded and so use much less oxygen than a Warm-blooded animal the same size. |
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