Since atmospheric pressure at sea level is around 14.7 psi, this will be added to any pressure reading made in air at sea levelre inch gauge or pounds per square inch gage (psig), indicating that the pressure is relative to atmospheric pressure.
This will be added to any pressure reading. This pressure reading is made in air at sea levelre inch gauge. This pressure reading is made in pounds per square inch gage (psig). The pressure is relative to atmospheric pressure. This is what pounds per square inch gage are indicating. Atmospheric pressure at sea level is around 14.7 psi.