ODM2 Units Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents. Mass per time In physics and engineering, mass flow rate is the mass of a substance which passes per unit of time. [Wikipedia: https://en.wikipedia.org/wiki/Mass_flow_rate] Mechanics QUDT http://qudt.org/vocab/quantity#Masspertime Also known as loading.