How should data be reported in Chemistry?. There are two kinds of numbers :. Exact numbers : may be counted or defined (they are absolutely accurate). Numbers obtained from measurements are not exact. These measurements involve estimating. You can report one estimated digit. 6.3 5 or
These measurements involve estimating.
2.2678.42 = 2.67842 x 103 6 s.f.
3. 1.7 2 s.f.
500 = 1 SF 500. = 3 SF 550 = 2 SF
On a measuring device, for example the measurement of 500 ml in a measuring cylinder, for the purposes of accuracy this is assumed to be an absolute value.
5. 62.50 to 2 significant figures
Significant figures can be found at: