Question 16

What do you mean by significant figures?


Significant figures are those meaningful digits that are known with certainty.

The significant figures in any number are all certain digits plus one doubtful digit. In order to report a scientific data, the data is expressed in significant figures in which all the digits reported are certain except the last one which is uncertain or doubtful.For eg 20.86 has four digits In all.Out of them 2,0 & 8 are certain digits while the last digit 6 is uncertain.Thus the number 20.86 has all the four digits as significant figures.Out of them 2, 0 & 8 are certain while 6 has some uncertainity about it.

Hence, significant figures are defined as the total number of digits in a number including the last digit that represents the uncertainty of the result.

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