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大气的总质量约为六千万亿吨,相当于地球质量的百万分之一。大气的厚度约一千公里,其中我们赖以生存的空气主要是地面十到十二公里范围的那一部分。人是完全靠空气生存的。成年人平均每天均需1公斤粮食和2公斤水,但对空气的需求就大得多,每天约13.6公斤(合10立方米),不仅如此,如果三者都断绝供应,则引起死亡的首先是空气。空气是多种气体的混合物,就其组成可以分为恒定的,可变的
The total mass of the atmosphere is about 6,000 trillion tons, which is equivalent to one millionth of the earth’s mass. The thickness of the atmosphere is about one thousand kilometers, of which the air we rely on is mostly that part of the earth that ranges from ten to twelve kilometers above the ground. People live on air completely. The average adult consumes 1 kilogram of food and 2 kilograms of water every day, but the demand for air is much greater at about 13.6 kilograms (10 cubic meters) per day. Not only that, but if all three are cut off, the first It is air. Air is a mixture of gases, and its composition can be divided into constant, variable