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Very interesting!

If suppose I do the experiment to find acceleration due to gravity at a place and if I get the value of g finally calculated as 9.7920 m/s2 then I give it as needed.

If I am supposed to give it only with two significant figure, then I would write g value as 9.8 m/s2

Or if it is to be with three significant figure, then I write as 9.79

Suppose, I do experiment to determine the density of a liquid. It is found to be 840.2 kg/m3

By scientific notation it could be written as 8.402 x 102 kg/m3

If it is enough to give with three significant figure then I write that one as 8.40 x 102 kg m-3

So I don't drop 0 though it does not have any value being in the second decimal place.

This is beauty of giving in significant figures

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