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Units of Measure
Oceans and Seas
The River Nile

What is the PSI at 400 feet below sea level?


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February 06, 2010 5:41PM

The pressure of liquid acting on a container or other body increases at the rate of 1 atmosphere or about 14.7 lbs. per square inch for every increase of 33 feet in depth. So doing the math results in: 400ft./33ft. = 12.121. Multiplying that by 14.7 lbs. per square inch yields about 178 lbs. per square inch at 400 feet deep.