Gauge vs Absolute Pressure
- Absolute = Atmospheric + Gauge
- Absolute Pressure is measured in psia
- Gauge Pressure is measured in psig
- Atmospheric Pressure = 14.7 lbs per square inch
The Confusion of Absolute/Gauge
- Most gauges read 0 psig at atmospheric pressure
- However, most formulas require Absolute Pressure
- YOU MUST ADD 14.7 to your psig when using formulas
