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NCERT Summary: Air around Us | Science Class 6 PDF Download
What is air?
- Air is a mixture of gases and dust particles. It is a clear gas in which living things breathe and live.
- Air is a matter it has volume and mass. It creates atmospheric pressure.
- In vacuum there in no air present over there.
Atmosphere: It is a thick layer of air surrounding the earth’s surface is known as atmosphere.
Wind: The moving air is known as wind.
Air composition
- Air contains mainly oxygen, nitrogen and remaining includes noble gases, carbon dioxide, water vapour, traces of other gases and dust particles.
- Oxygen and nitrogen: air contains 78% nitrogen, 21% oxygen and 1 % other gases and water vapour.
- Oxygen helps in burning. It is used by living things to respire,
- Nitrogen helps in growth of plant.
Carbon dioxide
- Air contains 0.003% of carbon dioxide.
- Carbon dioxide is also produced during burning.
- Plants and animals produce carbon dioxide during respiration.
Water vapour
- Air contains some amounts of water vapour depends upon the weather of a place.
- Water vapour presence is very important for water cycle in nature.
Dust and Smoke
- Smoke contains few gases with fine dust particles and is often harmful.
How does oxygen become available for all living beings?
Plants
- They use carbon dioxide of the air to make their own food by a process called photosynthesis.
Aquatic animals
- Most aquatic animals have special organs for respiration called gills. They use oxygen from air dissolved in water.
Amphibians
- Some amphibians like frogs, salamanders need breathing systems for both water and air.
- Frogs have lungs to breathe air when on land. In water, frogs breathe with their moist skin.
Birds
- They have pair of lungs with air sacs which is open all the time, because birds need high level of oxygen during flight.
Mammals
- They breathe with the help of lungs. They take oxygen and give out carbon dioxide.
Properties of oxygen
- Air is colourless
- Air is transparent
- It is essential for life
- It occupies space
- It present everywhere including water and soil
- It exerts pressure
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FAQs on NCERT Summary: Air around Us - Science Class 6
| 1. What is air made up of? |  |
Ans. Air is made up of a mixture of gases, primarily nitrogen (about 78%), oxygen (about 21%), and traces of other gases such as carbon dioxide, argon, and water vapor.
| 2. How does air support life on Earth? | |
Ans. Air supports life on Earth by providing oxygen for humans and animals to breathe. Oxygen is necessary for the respiration process, where it is used by living organisms to release energy from food.
| 3. How does air affect weather patterns? | |
Ans. Air plays a crucial role in weather patterns. Changes in temperature and pressure cause air to move, resulting in winds. These winds, in turn, affect the distribution of moisture and heat, leading to various weather conditions like rain, storms, and hurricanes.
| 4. How does air pollution affect human health? | |
Ans. Air pollution, caused by the release of harmful pollutants into the air, can have severe effects on human health. Breathing in polluted air can lead to respiratory problems, such as asthma and lung diseases. It can also worsen existing conditions, reduce lung function, and increase the risk of heart diseases.
| 5. How can we reduce air pollution? | |
Ans. There are several ways to reduce air pollution. Some effective measures include using cleaner energy sources like renewable energy, reducing vehicle emissions by promoting public transportation and electric vehicles, implementing stricter industrial emission standards, and practicing proper waste management techniques. Additionally, planting more trees and creating awareness about the importance of air quality can also contribute to reducing air pollution.
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Nov 22, 2024 Last updated |
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