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.
Report Abuse. Atomic mass is the mass of one atom of an element. example-atomic mass of oxygen is 16 which means that one single atom of oxygen weighs 16 units.Molar mass of oxygen is the weight of 1 mole(Avogadro's No.)of atoms or molecules of oxygen. Anonymous Â· 3 months ago. Thumbs up.