Air is not considered a pure substance; it is a mixture. A pure substance consists of only one type of particle and has a uniform composition throughout. In contrast, air is composed of a variety of gases, primarily nitrogen (about 78%), oxygen (about 21%), and small amounts of other gases such as argon, carbon dioxide, and trace gases. Because of this composition and the varying proportions of its components, air qualifies as a mixture rather than a pure substance.
is air a pure substance
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