Here's why:
* No chemical bonds: The gases in air, like nitrogen, oxygen, and carbon dioxide, are not held together by chemical bonds. They are simply mixed together due to their similar properties and the constant motion of molecules.
* Variable composition: The composition of air can change depending on location, altitude, and other factors. For example, air in a polluted city will have a higher concentration of certain pollutants compared to air in a remote forest.
* Separation is possible: The gases in air can be separated using physical methods, such as distillation or filtration. This wouldn't be possible if they were chemically combined.
In summary, air is a physical mixture of gases, not a chemical compound. The gases are not bound together by chemical bonds, and their proportions can vary.
