Class 4 Evs - ICSE-SCIENCE
Air - Properties, Composition, Air Pollution
In this chapter of EVS, Class 4 ICSE students explore air, an invisible blanket called the atmosphere that surrounds the Earth. Students learn about the unique properties of air, such as how it occupies space, has weight, and exerts pressure. The chapter details the composition of air, highlighting life-giving oxygen and essential nitrogen. Finally, it addresses the growing concern of air pollution, its harmful effects on health and the environment, and simple ways to keep our air clean. This foundational chapter is very important for board exam preparation as it builds core scientific awareness of our natural environment.
Start Learning FreeKey Concepts
Properties of Air
Air is invisible, has weight, occupies space, and can exert pressure in all directions.
Composition of Air
Air is a mixture of gases, mainly containing about 78 percent nitrogen, 21 percent oxygen, and 1 percent other gases like carbon dioxide, argon, and water vapor.
Atmosphere
The thick blanket of air that surrounds the Earth and protects all living things from harmful sun rays.
Air Pollution
The addition of harmful substances, smoke, and dust into the air, making it dirty and unsafe to breathe.
Ways to Prevent Pollution
Planting more trees, using public transport or bicycles, and reducing the burning of garbage help keep the air clean.
Important Formulas
Board Exam Info
In ICSE Science exams, this chapter typically carries around 5 to 8 marks. Common question types include fill in the blanks about the percentage of gases, short answers explaining properties of air, and descriptive questions on the causes and prevention of air pollution.
Frequently Asked Questions
Why can we not see air?
Air is made of gases that are colorless and transparent, which allows light to pass right through them without being seen.
Which gas in the air is most important for living things?
Oxygen is the most important gas because humans and animals need it to breathe and survive.
How do plants help keep the air clean?
Plants take in carbon dioxide and release fresh oxygen during the process of making their food, which helps clean the air.
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