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1.刚煮熟的热鸡蛋过冷水后特别容易剥壳,利用的是热胀冷缩的原理。因为热鸡蛋被冷水浇淋后会发生收缩,蛋身和蛋壳之间就产生了缝隙,这样壳就容易剥了。2.扳子、钳子、剪子可以帮助我们很方便地完成各种手工任务,利用的是杠杆原理,既便捷又省力。3.冬天手脚冰冷的时候,我们会不自觉地搓手搓脚,搓一会儿就会觉得不那么冷了,这是运用了摩擦生热的原理。
1. Freshly cooked hot eggs after the super-cold water is particularly easy to peel, the use of the principle of thermal expansion and contraction. Because the hot eggs will be shrinkage after being cast in cold water, crevices will develop between the egg body and the egg shell, so that the shell is easily peeled off. 2. Wrench, pliers, scissors can help us easily complete a variety of hand tasks, the use of the lever principle, both convenient and labor-saving. 3. When the hands and feet are cold in winter, we rub hands and feet unconsciously, rubbing for a while will not feel so cold, this is the principle of using friction heat.