CBSE Class 5 > Class 5 Notes > Science > PPT: Air and Water
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Page 1 Air and Water AIR AND WATER CHANGING THE SHAPE OF THE LAND Page 2 Air and Water AIR AND WATER CHANGING THE SHAPE OF THE LAND A I R Air is present everywhere. We cannot see air but we can feel it when it moves. The air is a mixture of gases. It contains about 78% nitrogen, 21% oxygen and 1% other gases like carbon dioxide, argon, helium, hydrogen and ozone. It also contains water vapour, dust and smoke. Page 3 Air and Water AIR AND WATER CHANGING THE SHAPE OF THE LAND A I R Air is present everywhere. We cannot see air but we can feel it when it moves. The air is a mixture of gases. It contains about 78% nitrogen, 21% oxygen and 1% other gases like carbon dioxide, argon, helium, hydrogen and ozone. It also contains water vapour, dust and smoke. COMPOSITION OF AIR Nitrogen: Nitrogen is not used by living beings directly from the air. Plants get nitrogen from the soil and animals get nitrogen from plants or meat. Nitrogen does not support burning. Its absence can make even a small fire uncontrollable. Oxygen: All living things need oxygen. Oxygen is also needed for burning. Page 4 Air and Water AIR AND WATER CHANGING THE SHAPE OF THE LAND A I R Air is present everywhere. We cannot see air but we can feel it when it moves. The air is a mixture of gases. It contains about 78% nitrogen, 21% oxygen and 1% other gases like carbon dioxide, argon, helium, hydrogen and ozone. It also contains water vapour, dust and smoke. COMPOSITION OF AIR Nitrogen: Nitrogen is not used by living beings directly from the air. Plants get nitrogen from the soil and animals get nitrogen from plants or meat. Nitrogen does not support burning. Its absence can make even a small fire uncontrollable. Oxygen: All living things need oxygen. Oxygen is also needed for burning. COMPOSITION OF AIR Other Gases: Carbon dioxide is used by plants for photosynthesis. It is also used in fire extinguishers. Argon is used in making bulbs and fluorescent tubes. Page 5 Air and Water AIR AND WATER CHANGING THE SHAPE OF THE LAND A I R Air is present everywhere. We cannot see air but we can feel it when it moves. The air is a mixture of gases. It contains about 78% nitrogen, 21% oxygen and 1% other gases like carbon dioxide, argon, helium, hydrogen and ozone. It also contains water vapour, dust and smoke. COMPOSITION OF AIR Nitrogen: Nitrogen is not used by living beings directly from the air. Plants get nitrogen from the soil and animals get nitrogen from plants or meat. Nitrogen does not support burning. Its absence can make even a small fire uncontrollable. Oxygen: All living things need oxygen. Oxygen is also needed for burning. COMPOSITION OF AIR Other Gases: Carbon dioxide is used by plants for photosynthesis. It is also used in fire extinguishers. Argon is used in making bulbs and fluorescent tubes. The Earth is surrounded by a blanket of air called the atmosphere. The atmosphere is held by the Earth’s gravity. It can be divided into five layers A T M O S P H E R ERead More
FAQs on PPT: Air and Water
| 1. What is the difference between air and water for Class 5 science? |  |
Ans. Air is an invisible gas mixture containing nitrogen, oxygen, and carbon dioxide, while water is a liquid compound made of hydrogen and oxygen. Both are essential for life-air for respiration and water for survival. Air fills spaces around us, whereas water flows and takes the shape of its container. Understanding these basic properties helps students grasp why both are vital natural resources.
| 2. How does air pressure work and why can't we feel it? | |
Ans. Air pressure is the force exerted by air molecules pushing down on Earth's surface due to their weight. Students can't feel it because the same pressure exists inside and outside their bodies, so there's no noticeable difference. Air pressure increases at lower altitudes and decreases at higher altitudes. Simple experiments like using a straw in water demonstrate how air pressure forces liquids upward, making this invisible force visible and understandable.
| 3. Why is water important for all living things and what does it do in our bodies? | |
Ans. Water is essential for life because it transports nutrients, regulates body temperature, and aids digestion in all living organisms. Plants use water for photosynthesis and structural support, while animals depend on it for hydration and survival. About 70% of the human body is water. Without adequate water intake, organisms cannot survive more than a few days, making it the most critical natural resource after air.
| 4. What are the different states of water and how do they change? | |
Ans. Water exists in three states: solid (ice), liquid (water), and gas (water vapour). These states change through processes like melting, freezing, evaporation, and condensation. Heat causes ice to melt into water and water to evaporate into vapour. Cooling reverses these changes-vapour condenses into water, and water freezes into ice. Understanding the water cycle and state changes helps explain weather patterns and natural phenomena in CBSE Class 5 science.
| 5. How do we get clean drinking water and why does water pollution matter? | |
Ans. Clean drinking water comes from treatment plants that filter, purify, and disinfect water from natural sources. Water pollution occurs when harmful substances contaminate water bodies, affecting aquatic life and human health. Pollution sources include industrial waste, sewage, and chemicals. Protecting water sources through conservation and responsible practices ensures future generations have access to safe drinking water, making water management crucial for environmental sustainability.
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May 21, 2026 Last updated
Document Description: PPT: Air and Water for Class 5 2026 is part of Science Class 5 preparation. The notes and questions for PPT: Air and Water have been prepared according to the Class 5 exam syllabus. Information about PPT: Air and Water covers topics like and PPT: Air and Water Example, for Class 5 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for PPT: Air and Water.
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