Term of the Day
The massA measure of the force required to impart unit acceleration to an object; mass is proportional to chemical amount, which represents the quantity of matter in an object. of a moleThat chemical amount of a substance containing the same number of units as 12 g of carbon-12. of substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula.; the same as molecular weightThe mass of one mole of molecules of a substance; the molar mass of a molecular substance. for molecular substances.