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10:20 ie 4s Gp, , , , € 1618159881-Unit... [Q, , &, i Ael, , TECH Malappuram (Teacher Empowerment through Co-operation and mutual Help), , Std 7, Unit-7, Pressure in Liquids and Gases, , Prepared by ILLIAS PERIMBALAM, GBHSS Manjeri, Mob : 9745200510, , , , Questions based on the activities in page 92, © Why couldn't the paper be lifted when unfolded?, , While unfolding, the area of the paper increases. So, more air applies, pressure on the paper., , * What force is effected so that the paper could not be raised?, , The force exerted by atmospheric air, that is the atmospheric pressure., Properties of air, , Air requires space to occupy, Air has weight, , Air has no shape, , Atmospheric air exerts pressure everywhere., , Forward and backward, , ‘After pushing the piston into the syringe, close the open end of the, syringe with your finger. Then pull the piston back quickly and release it., Don’t you see the piston moving fast into the barrel? Can you explain its, reason?, , When the piston is pulled back keeping the open end of the syringe closed, the pressure inside the, barrel decreases. In order to equalize the pressure, the air from outside exerts force on the piston., Hence the piston moves inwards., , , , enoennamngies 008 ailawlagad. caweje@Jo aflawlamoeg}o e1lasor8 TECH Malappuram veomi@owy30, ale 9002 AflaMlajlay WOT OOajg] Gai GqisqyoOas coimmo avventaaiont oars sabqyoes oargye., m/store/ay ua, , , , g, o, , ‘TECH Malappuram (Teacher Empowerment through Co-operation and mutual Hel,, , , , C oa)