| Absolute Pressure: |
Air at standard conditions (70 degrees (F) air at sea level with a barometric pressure of 29.92 in. Hg.) exerts a pressure of 14.696 psi. Thjis is the pressure in a system when the pressure gauge reads zero. So the absolute pressure of a system is the gauge pressure in pounds per square inch added to the atmospheric pressure of 14.696 psi (use 14.7 psi in environmental system work). |