the surprising experiment i am about to describe proves that air is all around you 阅读答案

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1、ThesurprisingexperimentIamabouttodescribeprovesthatairisallaroundyou阅读答案　　ThesurprisingexperimentIamabouttodescribeprovesthatairisallaroundyouandthatitprovesdownuponyou.Airpressureisawonderfulforce.Whenyouswimunderwater,youcanfeelwaterpushdownyourbody.Theairallaroun

2、dyoudoesthesame.However,yourbodyissousedtoitthatyoudonotnoticethis.Thepressureiscausedbyalayerofaircalledtheatmosphere.ThislayersurroundstheEarth,extendingtoaboutfivekilometersabovetheEarth’ssurface.　　Thefollowingexperimentisaneasyonethatyoucandoathome.Butmakesureth

3、atyouaresupervised,becauseyouwillneedtousematches.Nowfoetheexperiment！　　Whatyouneed　　·Ahard-boiledeggwithouttheshell　　·Abottlewithaneckslightlysmallerthantheegg　　·Apieceofpaper　　·Amatch　　Metheod　　1）Checkthatthepaperwillsitfirmlyontheneckofthebottle.　　2）Tearthepaperi

4、ntostripsandputthestripsintothebottle.　　3）Lightthepaperbydroppingaburningmatchintothebottle.　　4）Quicklysittheeggontheneckofthebottle.　　Result　　Astonishingly,theeggwillbesuckedintothebottle.Yourfriendswillbeamazedwhenyoushowthemtheexperiment.Butbecarefulwhenyouhandle

5、matches.　　Whyithappened　　Asthepaperburns,itneedsoxygenandusesuptheoxygen（air）inthebottle.Theeggactsasasealintheneckofthebottle,sonomoreaircangetinside.Thisreducestheairpressureinsidethebottle.Theairpressuremustequalize,somoreairfromoutsidemustenterthebottle.Theoutsi

6、deairpressureagainsttheeggandthentheeggispushedintothebottle!Theprovesthatairisallaroundandthatitispressingdownonit.　　60.Whyistheretheneedtotakecarewhenyouaredoingtheexperiment?　　A.Thebottlecouldbreak.　　B.Youneedtolightthepaperwithamatch.　　C.Theeggneedstobeshelled.　

7、　D.Theegghastobeperfectlyplacedontheneckofthebottle.　　61.Intheexperiment,theburninginsidethebottlecan___.　　A.equalizetheairpressureinsideandoutside　　B.makeasealintheneckofthebottle　　C.finishuptheoxygeninsidethebottle　　D.producemoreoxygeninsidethebottle　　62.Howdidthe

8、eggputintothebottle？　　A.Theoxygeninsidethebottlesuckedtheeggin.　　B.Itbecamesaltwithouttheshell.　　C.Theneckofthebottlewaswideenough.　　D.The