After that, in accordance with the meter's registration data (real volume) the volume rate of flow liquid is measured at the chosen point within the measurement range of the averaged volumetric rate (volume) of the stream in the pipeline.

This volume of gas per unit time is the volumetric flow.

By generating an oscillating volume flow between spatially separated points in the flow of medium, and measuring a resulting pressure difference, the mass flow rate through the tube can be established.

The invention is used for measuring the mass of a flowing medium, in particular for measuring the intake air mass of internal combustion engines.

A biomedical illuminator for increasing the blood flow volume in the illuminated portion by blinking a light with a wavelength having a blood flow accelerating action so as to exhibit a curative effect.