Lesson8Whatishumidity？什么是湿度？剖析.ppt

Lesson 8What Is Humidity？;New words and expressions;Several concepts 几个概念;Although there is a difference between percentage humidity and relative humidity, it is only very slight and is practically negligible at normal room temperatures. 尽管湿度百分数与相对湿度有所差别，但在通常的室温下差别很小，实际上可以忽略不计。 So, for our purposes, we can say that relative humidity indicates the amount of water vapor actually in the air expressed as a percentage of the maximum amount that the air could hold under the same conditions. 因此，对实际应用来说，我们可 以说相对湿度就是空气中实际所含的 水蒸气量和同条件下最大可能包 含水蒸气量的百分比。 ;;;;;;;;;Homework 作业