Chemistry / Unit 9 Chem 1610 short lesson, about 20 seconds
Average, Instantaneous, and Initial Rate
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The idea
An average rate spans a measured interval; an instantaneous rate holds at one moment; an initial rate is the instantaneous rate at the start.
In practice
A car's average speed over a trip is one number, but its speedometer at any moment gives the instantaneous rate.
Where people slip
An average rate over a long interval can differ from the initial rate, since reactions slow with time.
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