Q. 14.3( 103 Votes )
The number of sig A. 5
Rules for Counting Significant Figures
(i) All the non-zero digits are significant. In 1.248, the
number of significant figures is 4.
(ii) All the zeroes between two non-zero digits are
significant, no matter where the decimal point is, if at
all. As examples, 406 and 9.001 have 3 and
4 significant figures respectively.
(iii) If the measurement of number is less than 1, the
zero(es) on the right of decimal point and to the left
of the first non-zero digit are non-significant.
In 0.00606, first three underlined zeroes are
non-significant and the number of significant figures
is only 3.
(iv) The terminal or trailing zero(es) in a number
without a decimal point are not significant. Thus,
12.3 =1230cm=12300 mm has only 3 significant
(v) The trailing zero(es) in number with a decimal point
are significant. Thus, 3.800 kg has 4 significant
(vi) A choice of change of units does not change the
number of significant digits or figures in a measurement.
So, here using rule (iii) and (v) we get, in 0.06900
0.06900 the underlined part is not significant and the bold part is significant.
Therefore, the number of significant figures is 4.
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