Particle-size distribution

Granulometry
Basic concepts
Particle size, Grain size, Size distribution, Morphology
Methods and techniques
Mesh scale, Optical granulometry, Sieve analysis, Soil gradation
Related concepts
Granulation, Granular material, Mineral dust, Pattern recognition, Dynamic light scattering

In granulometry, 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.[1] Significant energy is usually required to disintegrate soil, etc. particles into the PSD that is then called a grain size distribution.[2][self-published source?]

Particle size distribution of coal-fired fly ash.
A log-normal distribution of coal-fired fly ash.
  1. ^ Jillavenkatesa A, Dapkunas S J, Lin-Sien Lum, Particle Size Characterization, NIST Special Publication 960-1, 2001
  2. ^ Sivakugan N, Soil Classification, James Cook University Geoengineering lecture handout, 2000.