A venturi meter is a device used to measure the flow rate of fluids in a pipe. It operates on the principle of fluid dynamics, specifically the Bernoulli's principle, which states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure. The meter consists of a tapered section that narrows and then widens, causing the fluid to speed up and its pressure to drop. As the fluid flows through the venturi meter, the difference in pressure between the wider and narrower sections can be measured. This pressure difference is directly related to the flow rate, allowing for accurate calculations. Venturi meters are commonly used in various applications, including water supply systems and industrial processes.