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Best Answer: w/w- an abbreviation for by weight, used in chemistry and pharmacology to describe the concentration of a substance in a mixture or solution ...
Below gives definitions of some basic keywords commonly encountered in chemistry. Since chemistry is the study of substances, we begin by looking at the basic unit of a substance, the atom: Atom - It is the smallest unit of a substance. The identity of a substance will be destroyed if its atom is further divided. Different substances will have different types of atoms.