It is mostly used when referring to air. I suppose it can be used but I would expect it to be inches cubed instead of per square inch when dealing with water.
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You can lift a locomotive or a house with 1 psi, if the pressure is applied over a large enough area.
.4 psi
limit is 86% of 93 psi = 86/100 x 93 psi ≈ 79.98 psi As the psi is measured to the nearest 0.1 psi, the safe limit is a measured 79.9 psi.
One psi (pounds per square inch) is 27.7 inches of water. An inch of water is a unit of pressure which will raise water one inch. A cubic inch of water weighs 0.0361 pounds, so one psi is one over 0.0361 or 27.7 inches of water.
Depends on the height. You gain approximately 0.4 psi for every foot of elevation; so at 10 foot elevation you will have ~4 psi.