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(一)空气是什么? 空气分布的范围很广,整个地球都在牠的層層包围之中,还包围地球所有的空气称为大气。空气不是一种单纯的气体,在它里面包含着的,最主要的是气体,此外常混有少量的固体,有时还存在着液体。近地面空气的成分,列在附表中,表内所谓永久气体是寻常的状况下呈气態的东西,需要在很低的温度及很高的压力下,才会变成液体或固体。固体物虽然为数很少,但却是天气变化的要角之一,可以做
(a) What is air? The air is distributed in a very wide range. The entire earth is surrounded by layers of it. It also surrounds all the earth’s air as the atmosphere. Air is not a pure gas. It is contained in it, the most important being the gas. In addition, it is often mixed with a small amount of solids and sometimes a liquid. The composition of near-surface air is listed in the attached table. The so-called permanent gas in the table is something that is gaseous under normal conditions. It needs to be liquid or solid under very low temperature and high pressure. Although the number of solid objects is small, it is one of the cornerstones of the weather. It can be done.