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. Molar volume The molar volume, symbol Vm, is the volume occupied by one mole of a substance (chemical element or chemical compound) at a given temperature and pressure. It is equal to the molar mass (M) divided by the mass density (?). [Wikipedia: https://en.wikipedia.org/wiki/Molar_volume] Chemistry New for ODM2 http://dbpedia.org/page/Molar_volume