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.

< Back to Glossary Main Page
< Back to Home Page


For Information and Ordering Call: 877-655-5100
Low Water Pressure FAQs | Low Water Pressure Glossary | About us
Links: Safe Drinking Water Systems | Water Filters, Reverse Osmosis, Water Treatment | Pressure Boosters