Gauge pressure is defined as?

Gauge pressure is defined as the pressure measured relative to atmospheric pressure. In this context, absolute pressure is the total pressure measured from a complete vacuum, which includes the atmospheric pressure. By subtracting one atmosphere (ata) from absolute pressure, you arrive at gauge pressure.

This distinction is essential in various aquatic applications because gauge pressure reflects the pressure experienced by a diver or a system at a specific depth without considering the atmospheric pressure acting on the surface. The atmospheric pressure is typically considered a baseline, which means that gauge pressure is effectively the net pressure exerted by the fluid at a specific depth.

This understanding is vital for divers to accurately interpret their depth readings, adjust buoyancy, and monitor air supply accordingly. Recognizing that gauge pressure provides a clearer representation of the pressure that divers and underwater equipment experience helps improve safety and performance in diving activities.