A solvent is a liquid that dissolves a solute, or solid. A saturated solution occurs when no more solute can dissolve in the solvent. The solubility of a substance determines how much can dissolve in a solvent. A solution consists of a solvent and solute mixed together uniformly. Dilute solutions have a low ratio of solute to solvent while concentrated solutions have a high ratio. The concentration of a solution refers to the ratio of materials dissolved. A mixture involves two or more materials distributed throughout each other.