出典:Wikipedia
出典:『Wikipedia』 (2011/06/21 15:13 UTC 版)
An air flow meter, commonly abbreviated to AFM, also known as an air consumption meter, is a device that measures how much air is flowing through a tube. It does not measure the volume of the air passing through the tube, it measures the actual speed of the air flowing through the device in a defined time segment. Thus air flow meters are simply an application of mass flow meters for a special medium. Typically, mass air flow measurements are expressed in the units of kilograms per hour (kg/h).