A mixture is a substance composed of two or more components that are not chemically bonded to each other. The components of a mixture retain their individual chemical identities and can be separated by physical means, such as filtration, distillation, or chromatography.

A constituent is a component of a mixture. Constituents can be either elements or compounds. For example, air is a mixture of nitrogen, oxygen, and argon. Nitrogen, oxygen, and argon are the constituents of air.

The main difference between a mixture and a constituent is that a mixture is composed of two or more substances, while a constituent is a single substance.