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They would be unwieldy and 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 . However, Like-A-Fish is an ongoing attempt to develop such a system in the real world. Sea water contains 7 Ppm oxygen. {Link without Title} This means that 1,000,000 kg (1,000 tons) of sea water holds 7 kg (15 lbs) of O2, the equivalent of 5,352 litres (1,400 gallons) of gaseous oxygen at atmospheric pressure. With a fully closed-circuit Rebreather , with which divers consume 1 litre (1 quart) of oxygen per minute, a diver would need to pass at least 192 litres (51 gallons) of sea water per minute, or 3.2 liters (3.5 quarts) each second. (This system would not work in Anoxic water.) Natural Gill s work because nearly all animals with gills are Cold-blooded and so require much less oxygen than a Warm-blooded animal the same size. SEE ALSO New Scientist article - history of attempts to develop artificial gills and the principles and problems involved REFERENCES |
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