菜单导航

一次小实验作文 小学三年级400字 A small experimental composition, the thir

作者: 满分作文大全 发布时间: 2019年09月10日 12:33:21

今天放学回后,妈妈带我壹起到菜场买菜,顺便帮我买了半斤鸡蛋,还买了两包盐,因为我要做壹个有趣的小实验。

回到家里,我迫不及待地拿出了两个玻璃杯,把两个杯里的水都装满,其中壹杯是清水,另壹杯清水加入两勺盐。然后我开始用筷子慢慢地搅拌着这杯有盐的的水,等杯里的盐融化了,我把鸡蛋轻轻地放进有盐的杯子里,另壹个鸡蛋放进没有盐的清水里,这时候,奇迹出现了,放盐水杯的鸡蛋居然浮了起来,而没有放盐的杯子鸡蛋却还是静静地沉在好底下。这是怎么回事呢!我查了电脑,原来盐水密比水大,盐子浓度与其密度成正比,当盐水密度达到鸡蛋密度时,鸡蛋就会浮起来了。

做了这个实验,使我明白了,当鸡蛋放入有盐的杯子里,鸡蛋没有浮力就会沉下去。我以后要经常动手做壹些既好玩,又增长见识的小实验,因为它不仅有趣,而且还能使我动手又动脑。

After school today, my mother took me to the market to buy food. By the way, I bought half a catty of eggs and bought two packets of salt, because I had to do a fun little experiment.

When I got home, I couldn't wait to take out two glasses and fill the water in both cups. One cup was water and the other cup was filled with two tablespoons of salt. Then I started to stir the salty water slowly with chopsticks, and the salt in the cup melted. I gently placed the eggs in a salted cup and the other egg in the salt-free water. At this time, the miracle appeared, and the eggs in the salt water cup floated up, but the eggs without the salt were still quietly sinking to the bottom. What is going on here! I checked the computer. The salt water is denser than water. The salt concentration is proportional to its density. When the salt water density reaches the egg density, the eggs will float.

did this experiment and made me understand that when the egg is placed in a salted cup, the egg will sink without buoyancy. I will often do some small experiments that are both fun and insightful in the future, because it is not only interesting, but also makes me feel the brain.