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UNIT 8
The kilogram
Study the following pictures.
What is common in the three pictures?
The standard unit
As you learned in UNIT 6 and UNIT 7, we use a standard unit to
measure length (m) and capacity (L).
In the same way, to measure the mass of objects, a standard unit is
needed.
The standard unit of mass is called the kilogram. The symbol is kg.
We can measure mass using scales as shown below.
0100
200
300
400
500
600
700
800
900
01
2
3
4
5
6
7
8
9kg