Gas solutescan be dissolved in gas, solid, or liquid solvents. Gas solutes follow Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of that gas above the liquid. 

Solid solutescan be dissolved into a liquid or a solid solvent. Solid solutes can vary in their solubility depending on factors such as temperature, pressure, and the nature of the solvent. 

Liquid solutescan be dissolved in liquids, and solids, but cannot be dissolved in gases.  Liquids are generally incompressible and have a density similar to that of their solid form (usually within a few percent) Liquids are fluid and thus they flow easily, allowing their molecules to move past each other. As a result, liquids take the shape of their container.