Ауа атмосферасының құрамы:

1) О2 -78% , N2 -21% , Аr-93%, СО2-0,03%, Н2-0,0001%.

2) СО2-78%, Н2-21%, О2-0,93%, N2-0,03%, Аr-0,0001%.

3) N2-78%, О2-21%, СО2-0,93%, Н2-0,03%, Аr-0,001%.

4) О2-78%, СО2-21%, Н2-0,93%, N2-0,0001%,  Аr-0,03%

5) N2-78%, О2-21%, Аr-0,93%, СО2-0,03%, Н2-0,0001%