Air - Chapter Wise CBSE Solved Question and Answer Based On NCERT
The atmosphere consists of mixture of gases having a relatively uniform composition in the lower layer. An average sample of pure dry air consist of nitrogen(78 %),oxygen (21%) and argon(0.9 %),other gases such as carbon dioxide, hydrogen helium and ozone are present in minute quantities. The lower layer of atmosphere also contains water vapour in variable quantities.
| Chapter 4 | Air |
