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Particle size distributions (PSDs) define the description of particle systems and of their separation processes in mechanical process engineering. Modern analytical methods, in particular image analysis, and their combination with material‐specific analytics record additional geometric and material parameters of particles. Many of these particle properties, like particle size, are not constant but also distributed, leading to a multi‐dimensional particle property distribution that can be used to describe particle processes. Thus, it is possible to define a partition function that quantifies separation in multidimensional space. The multidimensional approaches can be simply reduced in their dimensionality, so that the known one‐dimensional distribution functions, e.g., a PSD, can be obtained as marginal distributions. [ABSTRACT FROM AUTHOR]