Like all clouds, it forms when the air reaches its dew point, which is the temperature to which an air mass must be cooled for the water vapor in it to condense into liquid droplets.

和其他云一样，它是当空气达到凝结点，即空气团的温度冷却到使其中的水蒸气凝结成液态水滴的温度时形成的。

youdao

The NWS Web site features a handy on-line calculator for determining the heat index based on a combination of either temperature and relative humidity or temperature and dew point.

国家气象局(NWS)网站公布了一个方便的在线计算器便于大家基于温度和相对湿度或温度和露点的结合来计算炎热指数。

youdao

And the bubble line. Sometimes, instead of having a nice separation between the bubble and the dew line, there's a special point which for some reason those two curves meet. Non-ideality.

这是汽化线，有时汽化和液化曲线没有完全分开，因为某些原因，这两条线会在某个点相交，非理想情况。

youdao