Numbers
that are not subject to uncertainties in measurement
1
Exact Numbers
Numbers
that are derived from definition or
through counting
a)
b)
Will
have no impact on the precision expressed
in a numerical calculation.
12 inches = 1 ft.
1,000,000
μL
Examples:
1 L
40 students enrolled in this class
1760 yd.
1 mile
1 hr.
= 3600 sec.
because they are not measured quantities!