Air flow meter

It does not measure the volume of the air passing through the tube, it measures the mass of air flowing through the device per unit time, though Thus air flow meters are simply an application of mass flow meters for the medium of air.

Typically, mass air flow measurements are expressed in the units of kilograms per second (kg/s) or feet per minute (fpm), which can be converted to volume measurements of cubic metres per second (cumecs)[1] or cubic feet per minute (cfm).

In many industries, preheated air (called "combustion air") is added to boiler fuel just before fuel ignition to ensure the proper ratio of fuel to air for an efficient flame.

Pharmaceutical factories and coal pulverizers use forced air as a means to force particle movement or ensure a dry atmosphere.

Air flow is also monitored in mining and nuclear environments to ensure the safety of people.