The Absolute Pressure calculator computes the absolute pressure in a liquid gauge based on the density (ρ) of the fluid, height of fluid (h) in the column, atmospheric pressure (patm) and acceleration due to gravity (g).
INSTRUCTIONS: Choose the preferred units and enter the following:
Absolute Pressure (p): The pressure is returned in pascals (Pa). However, this can be automatically converted to other pressure units via the pull-down menu.
Young, Hugh and Freeman, Roger. University Physics With Modern Physics. Addison-Wesley, 2008. 12th Edition, (ISBN-13: 978-0321500625 ISBN-10: 0321500628 ) Pg 461, eq 14.8