A particlediagram that would best illustrate what a sample of air would look like will show a mixture of several molecules of different types representing the various gases in the air since it is a mixture.
A mixture is a physical composition of two or more substances and which does not alter the properties of the individual components.
Mixtures may be hom0genous or heterogenous.
Air is a hom0genous mixture of gases which include nitrogen, oxygen, carbon dioxide, water vapor, and other gases.
Therefore, the best illustration of air as a mixture will show the molecules of the different gases separate.
In conclusion, air is a mixture of gases.
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