Page 57 - Science Class 06

Material Lighter than water Heavier than water

Kerosene
Ice

Wood

Plas c
Stone

Iron nails

Transparency are transparent. Air is present everywhere

There are some materials which allow the and we can see everything around us . If we
light to pass through them. Such materials mark a black dot on a white-paper and then
are called transparent. The materials which place a bowl (made of glass) of water over
it, we can see the dot through this water.
do not allow the light to pass through them
are called opaque bodies. Glass-plate, polythene sheet, water, air, etc.

Let us elaborate this point: are the examples of transparent objects
while wooden plank, iron sheet, book, etc.
As for the air and the water, both of them are the examples of opaque objects.
allow light to pass through them. So, they

Aim : Test for transparent and opaque materials.

Procedure : Take some water in a tub and a piece of
glass. Look into them. You can look through both of
them easily. But if we try to look through a piece of
wood or a cardboard, we shall not be able to look
through it. So, materials can be transparent which
are made of glass and they help us to see be er. But
wooden doors are opaque and we cannot see
through them.

Smell Malleability
Some materials are recognised by their The property of malleability allows a
characteris c smell. Kerosene oil, petrol, substance to be beaten into very thin
rose flower, jasmine flower, etc. have their sheets. The substances having thing
characteris c smells. We say that some property are called malleable. Gold, iron,
substances have a pleasant smell while copper, silver, etc. are malleable.

others have unpleasant.

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