A dispersion is a heterogeneous mixture of at least two different starting materials. These starting materials are not or almost not soluble in one another or react completely with one another chemically. The starting materials are only brought together and mixed by an external energy supply, such as stirring or shaking. A dispersion occurs, for example, when an insoluble solid, which is the disperse phase, is finely distributed in a liquid, which is the dispersion medium. Nevertheless, the individual phases in a dispersion can be clearly distinguished from one another. For this reason, they can usually be separated from one another by physical methods such as filtering or sedimentation.