1.3 Units of measurements
Every measurement has two parts
Number
Scale (called a unit)
SI system (
le Systeme International
in
French) based on the metric system
Examples:
•
20
grams
•
20
k
g
=
20 X10
3
g
•
20
m
g
=
20 X10
-3
g
•
6.63
Joule seconds
Prefix