Air Pressure in Tank

When a pressure gauge on a tank reads 210 psi, it indicates the gauge pressure inside the tank, which is the pressure above atmospheric level. In this case, the range of air pressure in the tank would extend from 0 to 210 psi, with 0 psi representing atmospheric pressure and 210 psi being the additional pressure above atmospheric level.

This concept is based on the calibration of pressure gauges to read zero at atmospheric pressure, making them display the pressure above atmospheric pressure. Understanding this distinction between gauge pressure and absolute pressure is crucial when interpreting pressure readings in various systems.

In practical terms, the range of air pressure from 0 to 210 psi when the gauge reads 210 psi signifies the pressure difference from the ambient air pressure to the pressure level inside the tank. It is essential to have this accurate measurement to ensure the proper functioning and safety of the pressurized system.