What does a pressure gauge measure in piping systems?

A pressure gauge specifically measures the pressure of fluids within a piping system. By providing a visual representation of the pressure level, it allows operators and technicians to monitor system performance, detect potential issues, and ensure that the system operates within designated pressure limits. Maintaining correct pressure is crucial for the safety and efficiency of the system, as both overpressure and underpressure can lead to equipment failure or inefficient operation.

The other choices focus on different parameters that are not related to what a pressure gauge measures. For example, measuring temperature pertains to thermal management and is typically done with a thermometer. Flow rate is measured by flow meters that indicate the velocity of fluid movement, and clarity or quality of fluids, which relates to contamination or particulates, is assessed using filters or clarity meters. Each of these aspects plays a role in a piping system's overall operation, but they do not involve the function of a pressure gauge.