In chemistry, a<unk>  is a homogeneous mixture composed of two or more substances. In such a mixture, a<unk> ute is dissolved in another substance, known as a<unk> vent. A common example is a<unk> id, such as salt or sugar, dissolved in water, a liquid. Gases may dissolve in liquids, for example, carbon dioxide or oxygen in water. Liquids may dissolve in other liquids. Gases can combine with other gases to form mixtures, rather than<unk> s.  All<unk> s are characterized by interactions between the<unk> vent phase and<unk> ute molecules or ions that result in a net decrease in free energy.  Under such a definition, gases typically cannot function as<unk> vents, since in the gas phase interactions between molecules are minimal due to the large distances between the molecules.  This lack of interaction is the reason gases can expand freely and the presence of these interactions is the reason liquids do not expand.
Examples of<unk> id<unk> s are alloys, certain minerals and polymers containing plasticizers. The ability of one compound to dissolve in another compound is called<unk> ubility. The physical properties of compounds such as melting point and boiling point change when other compounds are added. Together they are called colligative properties. There are several ways to quantify the amount of one compound dissolved in the other compounds collectively called concentration. Examples include molarity, molality, and parts per million (ppm).<unk> s should be distinguished from non-homogeneous mixtures such as colloids and suspensions.
Solution
Swelling 
Fermentation 
Adsorption
Fluency
Staining
Deceleration
Secretion