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冬天里为什么在雪里撒盐或煤渣

更新时间: 2020-10-26 00:00:00     

1、撒盐能降低雪的熔点,加快雪的融化,而不至于结冰,盐和雪会形成氯化钠溶液,凝固点比水低,不易凝固,起到融雪作用;

2、撒煤渣能增加摩擦力,防止行驶的车辆车轮打滑;

3、煤渣的黑色比雪的白色吸热多,可以增快雪的融化速度;

4、食盐具有吸潮性,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。

关键词: 冬天 为什么 煤渣

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