Measuring instantaneous rates is the most direct way of determining the rate law of a reaction, but it is not always convenient, and it may not be possible to do so with precision.
piece (pÄs) n. 1. A thing considered as a unit or an element of a larger thing, quantity, or class; a portion: a piece of string. 2. A portion or part that has been separated from a whole: a piece of pie. 3. An object that is one member of a group or class: a piece of furniture.
In chess, the word piece has three meanings, depending on the context. 1  It may mean any of the physical pieces of the set, including the pawns. When used this way, piece is synonymous with chessman (Hooper & Whyld 1992:307) or simply man (Hooper & Whyld 1987:200). In play, the term is usually used to exclude pawns, referring only to a queen, rook, bishop, knight, or king.