Mixtures are combinations of two or more substances that are not chemically joined. Each substance keeps its own properties and can still be identified. Mixtures can include solids, liquids, or gases. Common examples are air, soil, and salads.

Mixtures are found everywhere in everyday materials on Earth. They can be separated into their parts by different methods. Many natural and human-made materials are mixtures. Mixtures are one way substances can exist together.