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The perfect answer requires understanding of the density of the water at different temperatures and pressures at all levels of depth. NOTE: The distinction between PSIG and PSIA is that PSIG is pressure as compared to local (atmospheric) pressure which becomes negative for a vaccum (pressure less than the local pressure). O PSIA is a perfect vacuum and normal atmospheric pressure is ~14.7 PSIA (0 PSIG when referenced to atmospheric local pressure) Without getting too "deep" into the perfect answer, using an approximation thumbrule of 1/2 psi increase per 1 foot of water depth, the answer is approximately 328 PSIG or ~ 343 PSIA.

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15y ago
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13y ago

The Water pressure of depth of 5,200 ft is so great it could crush a submarine and other diving objects so i would't going diving it will kill you or really injury to follow.

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9y ago

237 psi or 16.3 bar at 500 feet.

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9y ago

44 psi at 66 feet.

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9y ago

About 460 psi

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Q: What is the water pressure at 66 feet under water?
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Why is air that is pressurized needed in scuba diving?

The pressure on a diver's body increases quickly with depth. At the surface we're all breathing air at 14.7 PSIg, or 1 "Atmosphere" (atm). Each 33 feet of sea water results in another 1 atm of pressure. This means, for example, that a diver's body is under a total pressure of 3 atmospheres at 66 feet of sea water (one of air, two of water). The human respiratory system is designed to operate at normal atmospheric pressure of 14.7 pounds per square inch. If we descend to 33 feet, the water pressure exerts a force of nearly 30 pounds per square inch on our bodies. Our bodies are incapable of breathing against that much pressure. A scuba pressure regulator is designed to deliver air at the same pressure as the surrounding water, allowing us to breathe.


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Right at the surface of the ocean, the pressure is just the same as the air pressure at sea level; that is, one "atmosphere", or about 14.7 PSI (Pounds per Square Inch). But water pressure increases with increasing depth: For each foot of depth, the water pressure increases by 0.445 PSI. SCUBA divers, who need to be very aware their depth because of this pressure effect, often use this rule: Every 33 feet of depth, water pressure increases by one "atmosphere" (14.7 PSI). So, for example, at 66 feet the pressure on a diver is three atmospheres: There's one atmosphere of pressure from the air, and two atmospheres from the water.


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What are the pressure changes in scuba diving?

Let's take a moment to define some terms. The typical value used to represent air pressure at sea level is 14.7 pounds per square inch or 14.7 PSIg. You can think of 14.7 pounds as the "weight" of the entire column above a one square inch surface. For convenience, this pressure is also termed one "Atmosphere" or atm. The formal definition of one atm is 1.01325 x 105 pascals. Think of one atm as "about 15 PSIg". Unlike air, water has the property of not being compressible. The means a given volume of water "weighs" the same, regardless of depth. Accordingly, water pressure increases linearly with depth. It increases about 1/10 atm for each foot of sea water, or 1 atm every 33 feet. A diver at 33 feet of sea water is under a total pressure of 2 atm - one atm of air and one atm of water. At 66 feet, the total pressure is 3 atm, and so on. At 660 feet, the total pressure is 21 atm (660/33) of water plus one of air).