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.
Tweet. : a long piece of wood with a shorter piece across it near the top that people were once fastened to and left to die on as a form of punishment. the Cross: the cross on which Jesus Christ died. : an object or image in the shape of a cross that is used as a symbol of Christianity.