subject: How To Select a Proper Flowmeter [print this page] So, before you specify your flow meter, it is recommended to check whether to use mass units or volumetric units to obtain most useful flow information. To be sure, volumetric flow is not very useful in the case of compressible materials that do not have constant density. In such cases, it may be better to use mass flow meters that are insensitive to density and pressure as well as variations in viscosity.
