Sugar water is sugar dissolved in water, the solute is sugar and the solvent is water, so it is a mixture containing two substances.

A mixture is a substance made by mixing two or more substances. Mixtures do not have a fixed chemical formula, no fixed composition and properties, the composition of the various components of the mixture did not occur between the chemical reaction, will they maintain the original nature. Mixtures can be physically separated from the contained substances. Not composed by chemical synthesis.

Air containing oxygen (O2), nitrogen (N2), rare gases, carbon dioxide (CO2) and other gases and impurities; petroleum (crude oil) containing a variety of organic substances, natural water, solutions, muddy water, milk, alloys, fossil fuels (coal, natural gas, petroleum), seawater, salt water.

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The specific designation of the concept of "substance" varies depending on the discipline. In chemistry, a substance is any organic or inorganic substance with a specific molecular identity, including substances produced in whole or in part as a result of a chemical reaction or any compound of a naturally occurring substance; any element or non-chemical group of atoms.

Chemical substances include elements, compounds, by-products, reaction intermediates and polymers. However, it does not include mixtures, products (agents), or articles. Molecules can exist independently and are the smallest particles that maintain the chemical properties of a substance. Atoms are the smallest particles in a chemical change; in a chemical reaction, atoms recombine to form a new substance. Atoms combine with each other through chemical bonds to form molecules. Ions are electrically charged atoms or groups of atoms.