molar mass

This term is a technical specification used exclusively within chemistry and physics to quantify the mass of a substance per mole. It is a constant property of a chemical element or compound, serving as the bridge between the microscopic scale of atoms and the macroscopic scale of laboratory measurements.

Because it refers to a specific physical property, it is treated as an uncountable noun. It does not typically take a plural form in standard scientific discourse, as one refers to the molar mass of a specific substance rather than multiple molar masses of a single substance.