A flow meter is a tool used to measure the volumetric flow rate of a nonlinear, mass, liquid, or gas in a linear range. Flow measurement is an important part of manufacturing and performance testing of systems such as engines, pumps, compressors and heat exchangers, which are the main areas of interest of mechanical engineering.
In the case of fluids flowing in any of several channels, the measurement of velocities or flows is important for the investigation of many biological and meteorological phenomena, for the various processes of the industry and for carrying out various experiments in the laboratory.
In practice, various devices and methods have been developed which have various advantages and disadvantages relative to each other in order to measure speed and flow, or flow events in general.
In any flow measurement process, several factors play a role in the ion of the measuring instrument and method, including precision, capacity range and price.