Venturi meter is used to measure ___.

• A. Air Velocity
• B. Gas Pressure
• C. Water Flow
• D. Oil Viscosity

Answer: (C)

Venturi meters use a pressure difference created by a constricted throat to determine how much fluid is moving through a pipe. As the fluid flows into the narrower section, it speeds up, causing the static pressure to drop. By measuring the pressure upstream and at the throat and applying the Bernoulli principle with continuity, you can calculate the volumetric flow rate. This makes it a tool for measuring the flow of liquids, especially water in piping systems. It isn’t a direct instrument for measuring velocity, gas pressure, or viscosity, which is why water flow is the correct choice.