Question

What to do when uncertainty when rounded to proper significant figures is ± 0?

Answer 1

There is a rule to round off the significant figures.
i. if the last figure is greater than 5 thaen add 1 in the previous figure...
ii. If the last figure is less than 5 then add 0 in the previous figure.

Answer 2

iii. if the last figure is 5... then there are two more rules....
(I). if the previous figure is odd then add 1 in it...
(ii). if the previous figure is an even digit then add 0 in it.

Answer 3

for example.. 1.456 is a value having 4 significant figures.. we want to round off it... from 1st rule.... it will become 1.46.

Answer 4

For 2nd rule.. consider we have a value 1.332. then according to 2nd rule it will be 1.33

Answer 5

3rd example.. if we have 1.565... then from the 1st rule of the 3rd one... 1.56.

Answer 6

4th example .... if value is 1.375 the from 2nd rule of third rule... 1.36 will be rounded off figures...

Answer 7

you should always round the error up to 2 significant figures and then match the number of decimal places of the result with the error. for example: (2.0789+/-0.0065). doing this should never give you an error of (+/-0).