Superficial destruction of a surface by friction, pressure, ulceration, or trauma. The wearing away of a tooth by chemical or abrasive action. Also called odontolysis. erosion. The gradual wearing away of land surface materials, especially rocks, sediments, and soils, by the action of water, wind, or a glacier.
In chemistry, the molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by its amount of substance. The base SI unit for molar mass is kg / mol.
A substance's molar mass can be used to convert between the mass of the substance and the number of moles in that substance. Convert between the mass and the number of moles, and the number of atoms, in a given sample of compound. The molar mass of a compound is equal to the sum of the atomic masses of its constituent atoms in g/mol.