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.
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To convert inches of water to psi (pounds per square inch), you can use the conversion factor: 1 inch of water is approximately equal to 0.0361 psi. Therefore, 11 inches of water would be calculated as 11 x 0.0361 psi, which equals approximately 0.3971 psi.
1 centimeter equates to 0.393701 inches.
Inches of mercury x 0.4912 equals psi
1 ft. 8 in.
12 inches to 1 foot 15 x 12 = 180 inches