Invention Allows Humans to Breathe Like Fish

By Bill Christensen
06 June 2005

http://images.livescience.com/images/050606_breathe_01.jpg Alan Izhar-Bodner, an Israeli inventor, has developed a way for divers to breathe underwater without cumbersome oxygen tanks. His apparatus makes use of the air that is dissolved in water, just like fish do.

http://www.livescience.com/images/050606_breathe_A_03.jpg
(From Breathe like a fish!)

The system uses the “Henry Law” which states that the amount of gas that can be dissolved in a liquid is proportional to the pressure on the liquid. Raise the pressure - more gas can be dissolved in the liquid. Decrease the pressure - gas dissolved in the liquid releases the gas. This is exactly what happens when you open a can of soda; carbon dioxide gas is dissolved in the liquid and is under pressure in the can. Open the can, releasing the pressure, and the gas fizzes out.

Bodner’s system apparently uses a centrifuge to lower pressure in part of a small amount of seawater taken into the system; dissolved gas is extracted. . . .


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