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【简答题】
（3分）汽车是我们生活中最重要的交通工具之一，汽车在行驶时，发动机的温度会升得很高。为了确保安全，可用水循环进行冷却。实际上，水中往往还要加入不易挥发的防冻液（原液含量与凝固点、沸点关系如下表），加入防冻液后的混合液冬天不容易凝固，长时间开车也不容易沸腾。这是因为 。 防冻液含量/% 30 40 50 60 70 80 90 混合液的凝固点/℃ -17 -28 -37 -49 -48 -46 -28 混合液的沸点/℃ 103 104 107 111 117 124 141 冬天汽车前玻璃窗的雾气是由于的水蒸气遇到温度较低的玻璃， 形成的小水珠。可以打开空调对着车窗吹暖风，使小水珠 ，车窗玻璃就变清晰了。
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