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          當前位置:首頁 > 三年級作文 >

          一次有趣的實驗

          時間:2019-05-07作者:老來福來源:本站投稿

            一次有趣的實驗

            “噢!浮起來了!浮起來了!”一陣陣歡笑聲從快樂作文班里傳了出來,原來我們在做一個叫“雞蛋浮起來了”的實驗。

            實驗前,老師準備了六種實驗材料,分別是:一個雞蛋,一把勺子,一個量杯,一雙筷子,兩杯清水和一小包食鹽。

            實驗開始了,老師先把量杯倒入2/3水,然后將倒了水的杯子微微傾斜,再把雞蛋小心翼翼地放入水中。雞蛋就像喝醉酒似的,晃晃悠悠地往下墜,不一會兒就沉到杯底,一動不動了。

            老師問:“怎么才能讓雞蛋浮起來呢?”有一個同學回答:“把雞蛋弄破。”老師說:“NO,NO,NO,這樣雞蛋液會流入水中的。”也有的說:“加一點鹽。”

            老師繼續做實驗,我們屏住呼吸,靜靜地觀察。老師向杯里加了三勺鹽,然后拿起筷子攪拌了幾下,水變成了乳白色,可是雞蛋卻一點也沒有動。老師又放了三勺鹽,繼續攪拌。慢慢地,杯里的水越來越清澈。漸漸地,雞蛋真的浮起來了。

            大家爭先恐后地跑向講臺想看個究竟。我們每一個人都伸出手將雞蛋往下按,可是一松手,雞蛋便又浮起來了,真奇妙啊!郭映東還用手指沾了鹽水,伸出舌頭舔了一下,吃驚地大叫道:“好咸啊!”老師看到余和玉沒伸手,就端著杯子走到她面前叫她按一下,她搖了搖頭說:“我不想摸!”我十分好奇地問:“為什么雞蛋會浮起來呢?”

            還是老師揭開了謎底。原來清水的密度小于雞蛋,雞蛋就沉入水底;當清水里放入了大量的鹽,水的密度就超過了雞蛋,雞蛋就浮了起來。我們聽了恍然大悟!

            這個實驗告訴我們:萬事都有秘密。我們只有多學習,多觀察,多實驗,才能揭開謎底。

          香山學校三(7)班  伍泳琳

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