Particle-size distribution (PSD) refers to the measurement and characterization of the sizes of individual particles in a given sample of material. It provides information about the proportions of different particle sizes and is important in various fields such as material science, pharmacology, geology, and environmental science.
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The distribution of particle dimensions in an ensemble, with number-, volume- or intensity-weighting specified. Broad size distributions can broaden a melting transition, frustrate colloidal crystallization and bias scattering-based size estimates. A mean size alone is then insufficient.