* Solutions are homogeneous mixtures: This means the components are evenly distributed throughout. While air contains oxygen, it also contains nitrogen, carbon dioxide, and other gases. These components are not uniformly distributed.
* Solutions have a solvent and a solute: The solvent is the component present in the larger amount, and the solute dissolves into the solvent. In the case of air, there is no single dominant component that acts as a solvent.
* Solutions can be separated by physical means: You can separate the components of air by using techniques like fractional distillation. This means air doesn't fit the criteria of a true solution.
Instead of a solution, air is best described as a mixture of gases.
Here's a better example of a solution: Saltwater. Salt (the solute) dissolves completely in water (the solvent) forming a homogeneous mixture.
