Morsy
CHEM 101-Chapter 1
10
1.4
Uncertainty in measurement
Any measurement always
has some degree of uncertainty.
Record the certain digits
and the first uncertain digit
only.
[ certain + first uncertain]
The total numbers of the
digits are called
"
Significant Figures"
•e.g.,
Volume
= 22.2 ± 0.1 ml
Example 1.1:
What is the
difference between the measurements 25.00mL and 25mL?