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In very round numbers, the pressure at the surface of the water due to the atmosphere above it

is 14.7 pounds per square inch, or about 100 kPa, and it increases by that amount with each

additional 10 meters of depth. So at the depth of 200 meters, the total is the pressure of the

atmosphere plus 20 times as much additional, or roughly 309 pounds per square inch (2100 kPa).

Notice that it doesn't matter whether you're talking about the bottom of Hoover Dam or the bottom

of a 200-meter soda-straw. The length and width of the pool are irrelevant. The only dimension that

contributes to the pressure is the depth.

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