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doobalackie

1. Why do you exhale before you do a surface dive in a swimming pool or lake? Why do some people float better than others?
If a person does not exhale, the gas in the lungs will expand until the lungs are completely full. With continued ascent, the pressure in the alveoli increases and at an over pressure of 70-90 mm Hg, the alveoli will rupture. This pressure differential is proven to have documented cases of lung damage have occurred in six foot deep swimming pools. The most dangerous depth is the first 10 feet from the surface because this is where the largest volume changes occur. The same pressure changes occur deeper but the volume changes are so small that it is almost impossible to fully expand the l...

Posted by: Jessica Linton

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