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.
The molar mass of oxygen is the mass of one mole of oxygen. Oxygen forms a divalent molecule, so this is the mass of one mole of O 2. When you look up the atomic weight of oxygen, you find it is 16.00 g. Therefore, the molar mass of oxygen is: