A similar problem arises in instances where the flowmeter is used for custody transfer. This term
denotes scenarios where a particular material is being bought and sold, and where accuracy of flow
measurement is a matter of monetary importance. Again, in such instances, it is usually the number
of molecules being bought and sold that really matters, not how many cubic meters or gallons those
molecules occupy. Here, as with the chemical reactor feed flow application, a volumetric flowmeter
does not provide the most relevant information.