ten little fingers - arvind gupta (4 mb pdf)
ten little fingers - arvind gupta (4 mb pdf)
ten little fingers - arvind gupta (4 mb pdf)
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AIRThese simple experiments are fun to do. In each of these experiments whenever you blowair, its high speed creates a low-pressure zone, which makes things either come close orrise up in the air.Take a strip of card 50-cm long and 5 cmwide. Cut a window in its middle and bendits two legs to make it stand like a table.On blowing through the window both thelegs of the paper table come close together.Can you remove a table - <strong>ten</strong>nis ball from a glasswithout physically touching it ?Yes you can. Blow hard towards one wall of theglass and the ball will be ejected out of the glass.Take a thin strip of paper and hold it inthe gap between the thu<strong>mb</strong> and theindex finger. Then bring the thu<strong>mb</strong> closeto your mouth and blow horizontally.The strip will rise and float in the air.You can also tape the paper strip to theend of a plastic straw and blow through it.The strip will rise up and float horizontally.25-cm10-cm5-cm10-cmTape two light plastic balls to the ends of a 25-cm long thread. Tape a 5-cm longpaper strip in the middle to keep die balls apart. Hang the balls and use a plasticstraw to blow air between them. The balls will come close and strike each other.