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当前位置:首页 问答 小学 英语 英语阅读.(2-1)Theairsurroundingusisimportanttoeveryone.Withoutair,wecouldnotexist.Everyoneunderstandsthat.Butairisnecessaryinmanyotherways—waysthatarenotalwayssoobviousorwidelyknown.Forexample,ifwedidnothav
英语阅读.(2-1)Theairsurroundingusisimportanttoeveryone.Withoutair,wecouldnotexist.Everyoneunderstandsthat.Butairisnecessaryinmanyotherways—waysthatarenotalwayssoobviousorwidelyknown.Forexample,ifwedidnothav
更新时间:2025-06-10 14:25:38 专题:英语
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英语阅读.(2-1)

Theairsurroundingusisimportanttoeveryone.Withoutair,wecouldnotexist.Everyoneunderstandsthat.Butairisnecessaryinmanyotherways—waysthatarenotalwayssoobviousorwidelyknown.

Forexample,ifwedidnothaveair,therewouldbenosound.Soundtravelsthroughair.Wherethereisnoair,thereisnosound.Withoutair,therewouldbenofire.Therewouldbenoautomobiles,sincemotorsneedairinordertooperate.

Withoutair,therewouldbenowindorclouds.Therewouldbenoweather,asweknowit.Thenighttimewouldbeverycoldandthedaysveryhot.Wewouldbeforcedtoseekshelterfromthesun,astherewouldbenoatmospheretoprotectusfromthesun’sdeadlyrays.

Theatmosphereisalltheairsurroundingtheearth.Atmosphericpressureistheweightofallthatairagainstthesurfaceoftheearth.Ifwedidnothaveatmosphericpressure,wecouldnothaveautomobiletires.Thetireswouldswellorburstiftheydidnothavethepressureoftheatmosphereagainsttheirsurfaces.

Largeandpowerful,theatmosphereconsistsofanoceanofgaseshundredsofmileshigh.Itpressesdownonourbodieswithaforceofmorethanfourteenpoundspersquareinch.Thenarrowcolumnofairwhichrestsuponourshouldersweighsalmost2,000pounds.Butourbodiesarebuiltinsuchawaythatitsweightdoesnotcrushus.

Inthishugeoceanofairthereismoreenergythaninallthecoal,oil,andgaswehaveonearth.Electricalenergyiscollectedintheatmosphereaswateriscollectedandstoredinadam.Theexistenceofelectricityintheairhasbeenknownforcenturies.Menhavegazedinwonderatthebrightpatternsoflightninginstormclouds.Butathoroughstudyofelectricityintheatmospherewasnotpossibleuntilthedevelopmentofradioandradar.

Onescientist,Dr.SydneyChapman,hastriedtoexplaintheelectricfieldwhichsurroundstheearth.Hebelievesthatthegreatstormsonthesuncreatelargeamountsofelectricenergy.Thisenergyiscontainedinaverylightgascalledhydrogen.Theearthpullsthegastowardit,andaringisformedaroundtheearthseveralthousandfeetaboveitssurface.Thegreatspaceringisapowerfulcurrentofelectricalenergy.Sometimestheringcomesdownandcurvesintotheloweratmosphere,causingstrange

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