What is indicated by the pressure gauge on an SCBA?

The pressure gauge on a Self-Contained Breathing Apparatus (SCBA) provides critical information about the amount of air currently available in the cylinder. This measurement is typically expressed in psi (pounds per square inch) and indicates how much breathable air is left for the user.

As the air supply depletes during use, the pressure will decrease, allowing the firefighter to monitor remaining air and plan for a timely exit from hazardous conditions. Understanding this reading is vital for ensuring safety and effective management of resources during operations. While other options may relate to the overall function or performance of the SCBA, only the pressure gauge directly indicates the air supply available for breathing.