固体表面上有各种各样大小不同的孔。这是一个相当难于表征的物理量。它和许多物理的、化学的、生物的现象有着密切的关系,起着重要的作用。例如,利用每克表面积高达1000m~2的活性炭来做成防毒面具的过滤器。同样化学组成的催化剂,就由于孔的形状及大小分布不同,性能有好有坏,可见孔径分布的测定在催化及表面物理化学工作中是很有用的。 There are various sizes of holes on the solid surface. This is a very difficult to characterize the physical quantity. It is closely related to many physical, chemical and biological phenomena and plays an important role. For example, the use of activated carbon per gram of surface area up to 1000m ~ 2 to make gas masks filter. The same chemical composition of the catalyst, due to the pore shape and size distribution of different performance is good or bad, we can see the determination of pore size distribution in the catalytic and physical and chemical work is very useful.