* Solutions are homogeneous mixtures where one substance (the solute) is dissolved evenly throughout another substance (the solvent).
* Dry air is primarily a mixture of gases: nitrogen, oxygen, argon, and trace amounts of others.
While dry air is a homogeneous mixture, it doesn't fit the definition of a solution because:
* No substance is dissolved in another. The gases in dry air are simply mixed together.
* There's no clear distinction between solute and solvent. All the gases are present in relatively similar proportions.
Example of a solution: Salt dissolved in water. The salt (solute) is evenly distributed throughout the water (solvent).
Therefore, dry air is more accurately described as a homogeneous mixture of gases.
