suspension
A suspension is a heterogeneous mixture in which some of the particles settle out of the mixture upon standing. The particles in a suspension are far larger than those of a solution and thus gravity is able to pull them down out of the dispersion medium water . The typical diameter for the dispersed particles the sand of a suspension is about 1000 times greater than those of a solution less than approximately two nanometers for particles in solution, compared to greater than 1000 nanometers for particles in suspension . Unlike in a solution, the dispersed particles can be separated from the dispersion medium by filtering. Suspensions are heterogeneous because at least two different substances in the mixture can be identified.