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.
piece of the action, Informal. a share of the profits. [1175â1225; Middle English pece < Old French < Gaulish *pettia; akin to Breton pez piece, Welsh, Cornish peth thing] piecâ²er, n. usage: Definitions 21a and 21b are vulgar slang. Definition 21b is usually perceived as insulting. Piece a portion or quantity; a length.