A uniformly dispersed mixture at the molecular or ionic level, of one or more substances (the solute) in one or more other substances (the solvent). These two parts of a solution are called phases.Common types are:
liquid-liquid: alcohol-water
solid-liquid: salt-water
solid-solid: carbon-iron
Solutions that exhibit no change of internal energy on mixing and complete uniformity of cohesive forces are called ideal; their behavior is described by Raoult's law. Solutions are involved in most chemical reactions, refining and purification, industrial processing, and biological phenomena.The proportion of substances in a solution depends on their limits of solution. The solubility of one substance in another is the maximum amount that can be dissolved at a given temperature and pressure. A solution containing such a maximum amount is saturated. A state of supersaturation can be created, but such solutions are unstable and may precipitate spontaneously.