溶液是由两种以上物质组成的均匀、稳定的分散体系，被分散的物质（溶质）以分子或更小的质点均匀且稳定地分散于另一物质（溶剂）中。溶液是混合物。物质在常温时有固体、液体和气体三种状态。因此溶液也有三种状态，大气本身就是一种气体溶液，固体溶液混合物常称固溶体，如合金。一般溶液只是专指液体溶液。液体溶液包括两种，即能够导电的电解质溶液和不能导电的非电解质溶液。所谓胶体溶液，更确切的说应称为胶体。

电解质溶液中有能够自由移动的离子，因此能导电。

常见的溶液有海水、合金、空气。

"Solute" redirects here. For the sole order of the class Homoiostelea, see Solute (echinoderm).

In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase, and the solvent is commonly the major fraction of the mixture. The concentration of a solute in a solution is a measure of how much of that solute is dissolved in the solvent, with regard to how much solvent is present.