Question

we cannot see air but can feel its presence in different ways. Give some instancez from daily life to explain the fact.​

Answer 1

Answer:

We have learnt in Chapter 9 that all living things require air. But, have you ever seen air? You might not have seen air, but, surely you must have felt its presence in so many ways. You notice it when the leaves of the trees rustle or the clothes hanging on a clothes-line sway. Pages of an open book begin fluttering when the fan is switched on. The moving air makes it possible for you to fly your kite. Do you remember Activity 3 in Chapter 5 in which you separated the sand and sawdust by winnowing? Winnowing is more effective in moving air. You may have noticed that during storms the wind blows at a very high speed. It may even uproot trees and blow off the rooftops.

Answer 2

Answer:

We cannot see air but we can feel the presence of air. There are many examples by which we can feel the presence of air.

Explanation:

• We cannot see air. But we can feel its presence in so many ways.
• For example, we feel air when the trees rustle, clothes hanging on a clothes-line sway, pages of an open book flutters when the fan is switched on, when kites fly in the sky. In the rustling of leaves when the wind blows. In fluttering of the pages when the fan is switched on. On our face and arms when we move or sit under a moving fan. When the branches of a tree sway in the wind. In the forward-backward movement of clothes that are left to dry.
• Air is present all around us and everywhere on Earth. Air is a mixture of different gases such as  78% nitrogen, 21% oxygen and the remaining 1% is made up of small amounts of carbon dioxide and other inert gases.
• Air is present above ground, in the soil, and some amount is dissolved in water. Air is very important for the survival of all living things because air is necessary for breathing. We can live without food or water for a few days but not without air. Try holding your breath for a minute. You will feel uncomfortable and within a minute you will take a deep breath and inhale a large amount of air.

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