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.
Chapter 3 8 Molar Mass â¢ The atomic mass of any substance expressed in grams per mole (g/mol) is the molar mass (MM) of that substance.â¢ If the atomic mass of iron is 55.85 amu, then the molar mass of iron is 55.85 g/mol. Molar Mass = Mass mole m= n.