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冬季雪后,公路会因路面结冰而无法使车辆正常通行。许多城市采用在路面上撒大量的盐的方法,使冰很快熔化来保证车辆和行人的出行安全。小汉在思考一个问题:路面的冰不撒盐不能熔化,撒了盐之后很快熔化,是不是冰能从盐那里吸热?经过进一步的思考,小汉否定了这个想法,因为两个物体必须温度不同才能发生热传递,显然撒盐时,盐长时间暴露在露天环境中,冰和盐的温度应该差不多。
After the winter snow, the road will not be able to pass the normal traffic due to icy road. Many cities use a method of spreading a large amount of salt on the pavement to melt the ice quickly to ensure the safety of vehicles and pedestrians. Small Han thinking of a problem: the ice does not melt the pavement salt, salted quickly melted, is it ice can absorb heat from the salt? After further thinking, the small mind denied the idea, because the two objects It must be different in temperature to heat transfer, apparently salty, the salt exposed to the open air for a long time, the temperature of ice and salt should be about the same.