论文部分内容阅读
初中物理物态变化一章有这样一道题:夏日,剥去刚从冰箱内拿出来的冰棍纸后,看到冰棍在冒“白气”,请问是什么原因?上科版的《物理教学参考书》的回答为:冰棍冒的“白气”是冰升华产生的水蒸气凝成的小水滴;上科版《重点中学初中物理试题精选》一书的回答为:冰棍冒的“白气”是由于冰熔解及升华,从周围空气中吸收热量,使周围空气中的水蒸气温度降低而凝结成的小水珠.
The chapter on the change of physical state of junior middle school has such a question: In the summer, after peeling away the popsicle paper that has just been taken out of the refrigerator, I saw that the popsicle was taking “white gas”. What is the reason? The reference book’s answer is: The “white gas” that the popsicle took is a small droplet of water vapour produced by ice sublimation; the answer to the book “Selection of Key Middle School Physics Junior High School Questions” is: “Gas” is a small droplet of water that condenses into the surrounding air due to the melting and sublimation of ice, which causes the temperature of the water vapor in the surrounding air to decrease.