7. Definition and example of exact numbers. Definition of significant figures. With a high-accuracy rule, the length of an object is measured exactly at 9.00cm. Is the 9.00cm measured an exact number or an inexact number?
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In this case, the length of the object was measured exactly at 9.00 cm, which means it is an exact number. Show more…
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Define significant figure. Discuss the importance of using the proper number of significant figures in measurements and calculations.
Numbers encountered in science: Exact numbers: Counted or given by definition. Inexact numbers: Measured (with uncertainty) Examples: There are 12 eggs in 1 dozen. 1000 g in a kg 2.54 cm in an inch 1m = 100 cm 1kg = 2.2046 lb Counting objects: exact number of people in classroom
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