Quote:
Originally Posted by swatty
I will think you will find only a small air pressure difference between sealevel and 7000ft , however the pressure 7000ft underwater would crush you
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So is it primarily a difference in density between water and air?
I think that normal air pressure at sea level is approximately 14.7 psi, and that it decreases by about 1 psi for each 1000 feet of increased elevation. So you have about a 50% change in ambient air pressure.
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