Page 30 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

Activity 2.3: Measuring the mass of Length
objects Length is a measurement of the
distance or dimension from one point
Materials: Weighing balance, weights to another. For example, you can
(0.5 kg, 1 kg, 2 kg, and 5 kg), stones,
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flour, sugar, notebook, coins, textbook, measure the height of a human being,
and pencil or pen and plant, as well as the length of a leaf
and fish. Figure 2.24 shows examples
Procedure of instruments for measuring length

1. Put a weighing scale on a flat and Figure 2.25 shows how to use one
surface, such as a table. of the length measuring instruments.

2. Put half a kilogram weight on the
platform. Length can be measured using a ruler
3. Add a small amount of flour until or tape measure. Common units of
the weighing scale balances. expressing length are millimetres
4. What is the mass of the flour you (mm), centimetres (cm), metres (m),
have measured? and kilometres (km). These units of
5. Record your results in your length can be converted into other
notebook. units, as shown in Table 2.4.
6. Repeat procedures 2, 3, and 4 Table 2.4: Conversion of some
above using different weights to measurements
measure the different materials 10 mm = 1 cm 1000 m = 1 km
you have collected.
100 cm = 1 m 100 000 cm = 1 km
7. Prepare a short report of your
results.

(a)

(b)
Figure 2.24: Instruments for measuring length (a) ruler (b) tape measures

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