Q. 163.7( 63 Votes )

What do you mean by significant figures?

Answer :

The total number of digits in a measured physical quantity is called the number of significant figures. The number of significant figures refers to the precision of a measured quantity and may be defined as follows:

The number of significant figures in a measured physical quantity refers to number of digits written, including the last one whose value is uncertain.


Rules for Determination of Significant Figures:


[i] All non-zero digits are significant.


For example: 146 cm has three significant figures.


[ii] The zeros placed to the left of the first non-zero digit in the given physical quantity are not significant.


For example: 0.56cm has two significant figures.


[iii] The zeros placed to the right of the decimal point are significant.


For example: 15,0cm has three significant figures.


[iv] The zeros placed between two non-zero digits are significant.


For example: 6.08cm has three significant figures.


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