A metre rule is used to measure the length of a piece of string in a certain experiment. it is found to br 20cm long to the nearest milimetre. how should this result be recorded in a tablr of result?
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The significant figures in a measurement consist of all the certain digits in that measurement plus one uncertain or estimated digit. In the ruler illustration below, the bottom ruler gave a length with 2 significant figures, while the top ruler gave a length with 3 significant figures. In a correctly reported measurement, the final digit is significant but not certain. Insignificant digits are not reported. With either ruler, it would not be possible to report the length at 2.553cm as there is no possible way that the thousandths digit could be estimated. The 3 is not significant and would not be reported.
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