There are three different types of solutions, gaseous, liquid and solid.  A gaseous solution includes gases or vapors dissolved in one another.  Two or more gases can from a solution.  Air is an example of a gaseous solution.  When dry is is made up of oxygen gas dissolved in nitrogen gas.  A liquid solution contain a liquid solvent in which gas, liquid, or solid is dissolved.  Water is the most common liquid solution.  Many things can be dissolved in it.  Table salt is an example of a solid dissolved in a liquid.  A liquid and a gas can also be dissolved in a liquid solution.  A solid solution is a mixture of solids spread equally  throughout one another.  Metal is an example of a solid solution at room temperature. (Dorin 334-336)