做实验800字 鸡蛋浮起来了

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做实验800字 鸡蛋浮起来了
上课铃响了，老师面带微笑地走进教室。她先把一杯盛满水的玻璃杯放在讲台上，接着像变魔术似搜天猫券的从袋子里拿出一个鸡蛋、一把勺子和一袋盐。同学们面面相觑，不知老师的葫芦里卖的是什么药。
老师说:“同学们，今天我们来做个实验吧。”说着，米秀街优惠劵她拿起鸡蛋，小心翼翼地放进水里。大家都目不转睛地盯着杯子，只见鸡蛋一下子就沉入水里。老师笑着问：“鸡蛋为什么会沉入水中?”同学们议论纷纷，有的说：“鸡蛋太重了。”有的说：“鸡蛋太大了。”老师又将询问的目光投向大家，问：“怎样才能让鸡蛋不沉到水底?”同学们异口同声地说：天猫优惠券“加盐，加盐.。”“谁愿意上来试试?”大家争先恐后地叫着：“我!我!我!”顿时，教室里沸腾了。
第一个幸运儿诞生了，只见范思羽大步流星地走了上去，从盐袋里装了一勺盐，倒进水杯里，再把鸡蛋放下去，可鸡蛋还是像石头一样沉入水里。大家又大喊：“多加点，多加点!”小辣椒黄婧优把手举得高高的，嘴里叫着：“我来!我来加盐!”没等老师同意，她就径直走上前去，，往杯子里加了两勺盐，搅拌了几下，可惜鸡蛋并不给她面子，仍像个固执的老头，顽固地待在水里。
鸡蛋怎么没有浮起来呢?我想：也许盐的分量不够吧。我看过有关死海的报道，阿拉伯半岛上的死海含盐量很高，即使不会游泳的人也可以躺在水面，不会沉下去。想到这，我自信地举起手。老师见了，搜天猫劵请我上台。我迫不及待地走上前去，一把从黄婧优手里抢过勺子，胸有成竹地先把鸡蛋取出，然后一口气连加了三勺盐，慢慢地搅拌着。这可把一旁的黄靖优给急坏了，她夺过勺子，快速地搅拌着，慢慢地，杯子里的水渐渐变浑浊了。我把鸡蛋放进水中，这时，奇迹发生了，只见鸡蛋像个调皮的孩子东摇西晃地浮到了水面。实验成功了，大家都欢呼起来。老师笑眯眯地问我：“你为什么要再加盐?”我大声回答：“因为死海中盐分的含量达到22%，人躺在上面不会沉。所以，只要在水里加入足够的盐，增加水的浮力，水就会像一双有力的手把鸡蛋托起来。”大家听了恍然大悟，老师也赞许地点了点头。我的心里就像喝了蜜一样甜。
这次实验不仅让我品尝了成功的喜悦，更让我懂得了：只搜淘宝劵要我们平时多观察，多思考，多实践，就一定会有意想不到的收获。
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