Page 59 - science book 1

One Step Ahead
One Step AheadOne Step AheadOne Step AheadOne Step AheadOne Step Ahead
One Step AheadOne Step AheadOne Step AheadOne Step AheadOne Step Ahead
One Step Ahead
Hence, we have come to know
that air occupies space. Evaporation is the process of
USE OF AIR water changing into water vapour.

All living things need air to breathe.

Fish breathe through gills.

Balloons, aeroplanes, tyres, kites

and windmills, all need air to do
work.

Air helps to dry clothes.

Air is needed for burning.

How Does Air Become Dirty? Knowledge Plus

Air around us can get dirty. Smoke

from cars and buses makes the air Plants absorb polluted air and convert it
into clean.
dirty.

Smoke from factories also
makes the air dirty. Smoke

from burning leaves and
waste material pollutes

the air around us.

Million Dollar Advice

Do not sleep with all the windows closed.

Scientific Terms
Blowing : moving
Essential : necessary
Gills : a body part of the fish that helps it to breathe in water

Occupies : covers, fills a space
Smoke : visible vapours produced by burning of a substance

Chapter at a Glance

³ Air is all around us.
³ We cannot see or touch air.

³ Moving air is called wind.