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撒盐为什么能除雪

更新时间: 2020-09-16 00:00:00     

盐具有吸潮性。盐的表面通常被一层薄膜状的饱和盐溶液所包围,当这层薄膜溶液的蒸气压低于空气中水蒸气分压时,食盐就吸附空气中的水分而潮解;反之,当高于空气中水蒸气分压时则呈现干燥状态。

当我们把食盐洒在雪上时,食盐利用其吸潮特性吸附雪表层的水蒸气,从而使雪融化。

关键词: 为什么

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