A Complete Collection of 100000 Whys
Fav十万个为什么
为什么眼镜起雾看不清？
简单的摘要：眼镜起雾看不清的原因主要是温差导致水蒸气液化、镜片与脸部接触产生水汽以及环境湿度较高。
1、温差导致水蒸气液化：当冷的眼镜镜片遇到温暖潮湿的空气时，空气中的水蒸气会在镜片表面遇冷液化，形成小水滴，导致镜片起雾。例如，从寒冷的室外进入温暖的室内时，就容易发生这种情况。
2、镜片与脸部接触产生水汽：佩戴眼镜时，镜片与脸部，尤其是鼻子和嘴巴周围接触，这些部位呼出的气体中含有大量水蒸气。当这些温暖潮湿的气体接触到相对较冷的镜片时，也会发生液化现象，使镜片起雾。
3、环境湿度较高：在浴室、厨房等湿度较高的环境中，空气中含有大量水蒸气。当这些水蒸气遇到温度较低的眼镜镜片时，同样会发生液化，导致镜片起雾。环境温度越高，湿度越大，镜片起雾的现象就越明显。
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