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Particle-size distribution
The particle-size distribution (PSD) of a powder, or granular material, or particles dispersed in fluid, is a list of values or a mathematical function that defines the relative amount, typically by mass, of particles present according to size.〔Jillavenkatesa A, Dapkunas S J, Lin-Sien Lum, ''Particle Size Characterization'', NIST Special Publication 960-1, 2001〕 PSD is also known as grain size distribution.〔Sivakugan N, ''Soil Classification'', James Cook University Geoengineering lecture handout, 2000.〕
==Significance==
The PSD of a material can be important in understanding its physical and chemical properties. It affects the strength and load-bearing properties of rocks and soils. It affects the reactivity of solids participating in chemical reactions, and needs to be tightly controlled in many industrial products such as the manufacture of printer toner, cosmetics, and pharmaceutical products.
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