Quoted: Ok guys, it's time to work on that GED you always wanted.
The "pressure" of air under water which is in contact with the water = Same Pressure as the Water. This is one reason why divers develop the bends.
Thank you.
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not quite.
When we are living on dry land at sea level, the air around us has a pressure of 14.7 PSI (pounds per square inch), or 1 atmosphere. That is a "normal pressure" for our bodies. Because water is so heavy compared to air, it does not take much water to exert a lot of pressure. For example, a 1-inch by 1-inch column of water 33 feet high exerts another 14.7 PSI.
If you hold your breath and dive down 33 feet (10 meters), therefore, your lungs actually contract in size by a factor of two. They have to -- there is twice as much pressure around the air in your lungs, so they contract. When you rise back up the air expands again, so your lungs return to normal size.
The water does not compress, it is alway the same density and at the same pressure. The air is compressed and becomes more dense.