三年級英語有趣的實驗

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今天，楊老師面帶微笑地走進(jìn)教室，對大家說：“今天運氣真好—一大早就撿到了一塊燒不破的手帕！”聽了這話，教室里一陣騷動，大家都探討紛紛。有的說：“楊老師斷定在騙人！”有的說：“對！對！確實有燒不破的手帕！”這時，楊老師說：“不信做個測驗，怎么樣？”“好！好！”同學(xué)們異口同聲地說。

Today,Mr.Yangwalkedintotheclassroomwithasmileonhisfaceandsaidtoeveryone,"it"saluckyday-Ipickedupaburninghandkerchiefinthemorning!"Afterhearingthis,therewasacommotionintheclassroomandeveryonewastalkingaboutit.Somesaid,"MissYangmustbecheating!"Somesaid,"yes!Yes!Thereisindeedaburninghandkerchief!"Atthistime,Mr.Yangsaid,"ifyoudon"tbelieveindoinganexperiment,howaboutit?""Good!Good!"Thestudentssaidinunison.

于是，楊老師開頭做測驗了。她先拿出一塊上面繪有一只心愛的小白兔圖案的手帕，把它放入了含有70%酒精和３0%水的混合液體里。等全部被浸濕后，老師再把手帕拿出來，放入另一個事先打定好的盆里，又點燃一根火柴，那火柴上的火苗一碰手帕，整塊手帕就馬上被烈火圍住，只見火苗越竄越()高，火舌足有一尺來高呢！這時，我看到手帕上的“小白兔”在熊熊烈火中“冒死掙扎”，我越看越心疼，真夢想火快點熄滅。突然一股濃濃的酒精味撲鼻而來——原來是楊老師把火撲滅了。接著楊老師再把手帕表示我們看，“啊！完好無損！”有人詫異地喊道，“呀！太神秘了！”我情不自禁地想。正在我們詫異又納悶的時候，楊老師給出了答案，原來：酒精是易燃的，而水是吸收熱量的，在燃燒的過程，水一面吸收熱量一面將火與手帕隔開，這樣，手帕就不會被燒破了。

SoMissYangbegantodotheexperiment.First,shetookoutahandkerchiefwithapictureofacutelittlewhiterabbitonitandputitintoamixtureof70%alcoholand30%water.Afterbeingsoaked,theteachertookoutthehandkerchief,putitintoanotherpreparedbasin,andlitamatchagain.Assoonastheflameonthematchtouchedthehandkerchief,thewholehandkerchiefwasimmediatelysurroundedbythefire.Isawthatthefirewasrunninghigherandhigher,andthefiretonguewasafoothigh!Atthistime,Isawthe"littlewhiterabbit"onthehandkerchief"strugglingdesperately"intheragingfire.ThemoreIsawit,themoreIfelthurt.Ireallyhopethefirewouldgooutsoon.Suddenlyastrongsmellofalcoholcametomynose-itwasMissYangwhoputoutthefire.ThenMissYangshowedusthehandkerchiefagain,"ah!Ingoodcondition!"Somepeopleexclaimedinsurprise,"ah!It"samazing!"Ican"thelpthinking.Whenweweresurprisedandpuzzled,Mr.Yanggavetheanswer.Itturnsoutthatalcoholisflammable,whilewaterabsorbsheat.Intheprocessofcombustion,waterabsorbsheatandseparatesfirefromhandkerchief,sothathandkerchiefwillnotbeburned.

??！科學(xué)真奇異，我確定要努力學(xué)