Air has dust particles in it. To check this out, let us do this experiment. Close all the doors and windows of a room and make it dark by drawing the curtains. Now allow the light to enter from a small hole in the door or window. Observe the beam of light. 1. What do you see in the beam of light? 2. What do you come to know from this?
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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. 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
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1. dust particles
2. they are rapidly moving
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