RBSE Class 6 Science Chapter 11 pdf: Air Around Us (हमारे चारों ओर हवा)

Q: Q1: What is the composition of air? (हवा के घटक क्या हैं?)

The composition of air includes 78% nitrogen, 21% oxygen, 0.03% carbon dioxide, water vapor, and other gases like argon and ozone.

Class 6 Science Chapter 11 pdf In Chapter 15 of RBSE Class 6 Science, titled Air Around Us (हमारे चारों ओर हवा), students learn about the composition, importance, and properties of air. Air is an essential part of our environment, and this chapter explains how it supports life and how different elements like oxygen, nitrogen, and carbon dioxide make up air. Through this chapter, students will also understand the movement of air and how it plays a crucial role in maintaining life on Earth.

RBSE Class 6 Science Chapter 11 pdf: Air Around Us (हमारे चारों ओर हवा)

RBSE Class 6 Science Chapter 11 pdf in english

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Key Topics in Chapter 15: Air Around Us (मुख्य विषय)

What is Air? (हवा क्या है?)
Composition of Air (हवा का घटक)
Air and Life (हवा और जीवन)
Movement of Air (हवा का संचलन)
Importance of Air (हवा का महत्त्व)
How Air is Contaminated (हवा का प्रदूषण कैसे होता है?)

1. What is Air? (हवा क्या है?)

Air is a mixture of gases that surrounds the Earth and is essential for life. It is colorless, odorless, and tasteless. Air makes life possible by providing oxygen for breathing and helping plants with photosynthesis. Without air, life on Earth would be impossible.

Example (उदाहरण): When we breathe in, we take in oxygen from the air, which is used by our body for energy.

2. Composition of Air (हवा का घटक)

Air is made up of several gases in different proportions. The main components of air are:

Nitrogen (नाइट्रोजन) – About 78% of air is nitrogen, which is inert and does not support burning.
Oxygen (ऑक्सीजन) – About 21% of air is oxygen, which is essential for respiration in living organisms.
Carbon Dioxide (कार्बन डाइऑक्साइड) – A small amount of about 0.03% of air is carbon dioxide, which is used by plants for photosynthesis.
Water Vapor (पानी वाष्प) – Water vapor is present in varying amounts and is responsible for humidity in the air.
Other Gases (अन्य गैसें) – Argon, ozone, and trace gases are also present in small quantities.

3. Air and Life (हवा और जीवन)

Air is crucial for life on Earth. Different organisms depend on air for respiration and other vital processes. Here are a few ways air supports life:

Respiration (श्वसन): Animals, including humans, inhale oxygen from the air and exhale carbon dioxide.
Photosynthesis (किरण संश्लेषण): Plants take in carbon dioxide and release oxygen during photosynthesis, which helps support life.
Protection from Harmful Rays (हानिकारक किरणों से सुरक्षा): The air, especially the ozone layer, protects Earth from harmful ultraviolet (UV) rays of the sun.

4. Movement of Air (हवा का संचलन)

The movement of air is known as wind (हवा). Winds occur due to the uneven heating of the Earth’s surface by the Sun. When air gets heated, it expands and becomes lighter, rising up. Cooler air then moves in to replace it, creating wind.

Example (उदाहरण): Sea breeze and land breeze are caused due to the differences in temperature between the land and water bodies. During the day, the land heats up faster than the sea, causing air to move from sea to land (sea breeze). At night, the land cools down faster, and the air moves from land to sea (land breeze).

5. Importance of Air (हवा का महत्त्व)

Air is important for several reasons:

Breathing (श्वास लेना): Oxygen in the air is essential for breathing and survival.
Photosynthesis (किरण संश्लेषण): Plants use carbon dioxide from the air to make food through photosynthesis.
Weather and Climate (मौसम और जलवायु): Air plays a key role in regulating the weather and climate patterns.
Sound Transmission (ध्वनि संचरण): Sound waves travel through air, allowing us to hear sounds.
Aids in Combustion (दहन में सहायक): Air, especially oxygen, is necessary for burning fuels.

6. How Air is Contaminated (हवा का प्रदूषण कैसे होता है?)

Air pollution is a major concern in today’s world. It is caused by harmful substances such as dust, smoke, chemicals, and gases that are released into the air.

Sources of Air Pollution (वायु प्रदूषण के स्रोत): Factories, vehicles, burning of fossil fuels, and agricultural practices are common sources of air pollution.
Effects of Air Pollution (वायु प्रदूषण के प्रभाव): It can cause respiratory diseases, global warming, and damage to the environment.

FAQs on Air Around Us (RBSE Class 6 Science Chapter 15)

Q1: What is the composition of air? (हवा के घटक क्या हैं?)

The composition of air includes 78% nitrogen, 21% oxygen, 0.03% carbon dioxide, water vapor, and other gases like argon and ozone.

Q2: How is air important for life? (हवा जीवन के लिए क्यों महत्वपूर्ण है?)
A: Air provides oxygen for respiration, carbon dioxide for photosynthesis, and protects us from harmful UV rays.

Q3: What causes wind? (हवा को क्या उत्पन्न करता है?)
A: Uneven heating of the Earth’s surface by the Sun causes air to move, creating wind.

Q4: What is air pollution? (वायु प्रदूषण क्या है?)
A: Air pollution is the presence of harmful substances like dust, smoke, and gases in the air, which can damage health and the environment.

Q5: What are the effects of air pollution? (वायु प्रदूषण के प्रभाव क्या हैं?)
A: Air pollution can cause respiratory diseases, global warming, and harm the environment.

Download Chapter 15: Air Around Us – PDF Notes

For detailed notes, important concepts, and additional practice questions on Chapter 15: Air Around Us, you can download the PDF to enhance your understanding of this chapter.

Download Chapter 15 Notes in PDF

Conclusion (निष्कर्ष)

In Chapter 15: Air Around Us, students gain a comprehensive understanding of the air that surrounds us and its importance in sustaining life. From the composition of air to the movement of air and its importance, this chapter teaches how air supports all living organisms and plays a vital role in our daily lives. Understanding the concepts in this chapter will help students appreciate the air around them and the need to protect it from pollution.

For more study materials and solutions, visit our RBSE Solutions for Class 6 Science and enhance your learning experience!