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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 ...
Equivalent (chemistry) An equivalent (symbol: Eq) is the amount of a substance that reacts with (or is equivalent to) an arbitrary amount of another substance in a given chemical reaction. It is an archaic unit of measurement that was used in chemistry and the biological sciences in the era before researchers knew how to determine the chemical formula for a compound.