What does a pressure gauge measure in a hydraulic system?

In a hydraulic system, a pressure gauge is specifically designed to measure fluid pressure. This measurement is crucial because it helps operators understand how much force the fluid is exerting within the system. Pressure is a key parameter in maintaining the efficiency and safety of hydraulic systems, as it influences performance, determines if the system is operating within safe limits, and can indicate possible issues, such as leaks or blockages.

Fluid temperature, viscosity, and flow rate, while important parameters in hydraulic systems, are not measured by a pressure gauge. Temperature gauges would be utilized to assess fluid temperature, viscometers for fluid viscosity, and flow meters for fluid flow rate. Each of these measurements is important in its own right but does not overlap with the primary function of a pressure gauge. Thus, the correct answer clearly identifies the specific role of the pressure gauge in hydraulic systems.