Which measurement indicates the pressure in a plumbing system?

The measurement that indicates the pressure in a plumbing system is PSI, or Pounds per Square Inch. This unit quantifies the pressure exerted by a fluid, which is crucial in understanding how water moves through pipes, fixtures, and other plumbing components.

In plumbing, maintaining adequate pressure is essential for ensuring that water reaches faucets, hoses, and other outlets effectively. PSI is widely used in various applications, from residential plumbing systems to industrial settings, making it a standard measurement for identifying pressure levels.

While other units like bar or inches of water column can also represent pressure, PSI is the most commonly referenced in plumbing contexts. Bar is another pressure measurement but is often less familiar to those working with household plumbing systems. Inches of water column is used for measuring lower pressures in specific scenarios, such as in the case of gas lines or certain appliances, but does not provide the broad applicability that PSI does. Gallons per minute, on the other hand, is a measure of flow rate, not pressure, and therefore does not indicate the pressure within the plumbing system.