A Venturi meter is a flow measurement device, commonly utilized in the water supply industry. A Venturi meter specifically uses a converging section of pipe to increase flow velocity. A corresponding reduction in pressure permits a determination of the flow rate.
The Venturi meter is based on the Venturi effect. The Venturi effect signifies a decrease in pressure caused by an increase in velocity that results from the narrowing of a tube through which a liquid flows. The Venturi effect only applies to the flow of liquids. The Venturi effect is named after an Italian physicist named Giovanni Battista Venturi who lived from 1746 until 1822.