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Prove that 'Air contains dust and smok...

Prove that 'Air contains dust and smoke' .

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Close all the doors and windown with curtains pulled down to make the dark . Now open the door or a window facing the sun , just a little, in such a way that it window facing the sun , just a little, in such a way that it allows sunlight to enther the room only through a slit . we see some tiny shining particles moving in the beam of sunlight . This shows that air also contains dust particles.
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