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The 30ft of water is sometimes useful since it means that each foot of water column in the tank is about 0.5psi.

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jtm

The pressure of one atmosphere is 1,013,000 dynes/square centimeter, which converts to 14.696 psi. The mercury-column barometer reads 760 mm in height at one atmosphere of pressure. A water depth of 33.91 feet has a pressure of one atmosphere (14.696 psi.) Each aded 33.91 feet of water depth adds another atmosphere.

OBTW, a lot of the confusion revolves around the British engineering system's use of the pound as both a unit of force and a unit of mass. A mass of one pound weighs one pound. These two units are actually called pound-mass (lbm.) and pound-force (lbf.) To convert one lbm. to .lbf, multiply by 32.2 feet/sec. squared.

Metric doesn't do this, in the standard system, (SI) the unit of mass is the kilogram, and the unit of force is the Newton. One kilogram weighs 9.8 Newtons. One gram weighs 980 dynes. One pound weighs 1 pound. Clear now?

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have fun

jtm

Tank specs in profile

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