同学们都知道,雨、雪、雾、霜等现象,都是水的物态发生变化形成的。究竟“云、雾是什么东西?”你可能会说:“是地面上蒸发到空气里的水蒸气,飘浮在高空的是云,靠近地面停留的是雾。”这个说法对不对呢?让我们先来看一件每个戴眼镜的人在冬天都感到头疼的事:从寒冷的室外进入温? Students know that phenomena such as rain, snow, fog, and frost are caused by changes in the state of water. What “clouds and fogs are anything?” you might say: “It’s the vapor that evaporates into the air on the ground. The clouds that float in the sky are high and the fog that stays close to the ground.” That’s right? Let us Let’s look at one thing in which each person who wears glasses feels a headache in winter: from the cold outdoors into the warm?