# Venturi tube

A venturi tube is a tube or pipe which employs a temporary restriction or narrowing in its length to reduce the pressure and increase the velocity of a fluid or gas passing through it. This phenomenon of simultaneous pressure reduction and velocity increase is known as the venturi effect and has a number of uses such the measurement of fluid flow. There are several types of venturi tube profiles in general use with a gradual change in profile being the most effective. The calculation standard detailing the pressure loss over a venturi tube is found in Pipe Flow - A Practical & Comprehensive Guide - AIChE [24].