身边的科学二年级

✎作文范文

there are many scientific phenomena around us. we can always find them if we pay attention to observation. one summer afternoon, my mouth was dry with heat, and i thought, if only i had a glass of ice water, there should be water in the kitchen. walking into the kitchen, i could not anticipate that there was a pot of water on the table. i was so happy that i poured the water into the cup immediately. a cup of hot air came out of the cup. it turned out to be boiling water. how can we make the boiling water cool down quickly? so i put the water in the refrigerator, and after a few seconds, i heard a ang and the water trickled out along the crack in the refrigerator. i was startled and quickly opened the fridge door. i suddenly froze. how could a good cup break? through consulting the information, i know the cause of the cup e_plosion, is the principle of hot e_pansion and cold contraction: because the cup filled with boiling water makes the cup internal heating e_pansion, the temperature in the refrigerator and the cup e_ternal cold contraction, so that the cup internal e_pansion, e_ternal or cold, delayed e_pansion, the cup e_ploded. from this, i understand a truth: science is everywhere, as long as we observe carefully, we can find many things we do not know through our own efforts. 身边的科学

我们身边有许多科学现象，平时只要留心观察，就一定能发现它们。

在一个夏天的中午，我热得口干舌燥，心想：”要是有杯冰水喝就好了，厨房里应该有水。“走进厨房，果然不出我所料，桌子上放着满满一壶水。我高兴极了，马上把水倒进杯子。一股热气冒出杯口，原来，这是壶开水！怎样才能让开水迅速凉下来呢？于是我把水放进了冰箱，过了几秒钟，只听”砰“地一声，水沿着冰箱缝徐徐流出。我吓了一大跳，迅速打开冰箱门，我顿时愣住了，好好的杯子怎么会破呢？通过查阅资料，我知道了杯子爆炸的原因，是热胀冷缩的原理：因为杯子里装的开水使杯子内部受热膨胀，冰箱里的温度又使杯子外部受冷收缩，就这样，杯子内部不断膨胀，外部还是凉的，迟迟不膨胀，杯子就爆了。

从这件事中，我明白了一个道理：科学无处不在，只要我们认真观察，就能通过我们自己的努力发现许多我们许多不知道的东西。