Page 14 - Science Class 6 Times Publication

But the volume of liquids is measured in the unit litre. Cubic metre and
litre are related as:

3
1 cubic metre (m ) = 1000 litres(l)
Volume of solids

It is easier to measure the volume of regular solids. The volume of
a cuboid solid is determined by measuring its length, breadth and
height.

Volume = l × b × h

Activity 1.4

Measure the length, breadth and height of your science book and
calculate its volume.

But the volume of irregular solids cannot be determined by using
the formula. Their volume is determined with the help of measuring
cylinder .

Activity 1.5

Observe the levels of different liquids in a measuring cylinder.

Take a measuring cylinder and pour some water into it. Then observe
the surface of water carefully.
What will you observe ?

You will see that the level of water is depressed at the middle. The
water level at the side is raised little above. It is because water wets
the walls of the vessels. The surface of liquid which is raised at the
side and depressed in the middle is called concave meniscus. The
liquids such as water, oil, kerosene, alcohol, etc form the concave
meniscus. We should observe the volume of such liquids by keeping
eyes straight to the lower meniscus of the liquid level.
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Times' Crucial Science and Environment 10 Book 6