
Glossary: Water Pressure Key Terms 
Water Pressure Equations and Conversions
Some common water pressure equations and conversions include:
One lb. Per sq. in. = 2.31 ft. water @60 degrees F.
One lb. Per sq. in. = 2.04 in hg. @ 60 degrees F.
One foot water @ 60 degrees F = 0.4333 lb. per sq. in.
One foot water @ 60 degrees F = 0.884 in. hg @ 60 degrees F.
One inch hg at 60 degrees F = 0.49 lb. per sq. in.
One inch hg at 60 degrees F = 1.13 ft. water @ 60 degrees F.
One lb. per sq. inch = lb. per sq. in. gauge (psig) + 14.7 Absolute (psia)
Steam rising from water at its boiling point has a pressure equal to the atmosphere (14.7 psi).
To find the pressure in "psi" of a column of water, multiply the height of the column in feet by .434.
Friction of liquids in piping increases as the square of the velocity.
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