ISO 9276-2:2014 PDF

Scope: This part of ISO 9276 provides relevant equations and coherent nomenclatures for the calculation of moments, mean particle sizes and standard deviations from a given particle size distribution. Two notation systems in common use are described. One is the method of moments while the second describes the moment-ratio method. The size distribution may be available as a histogram or as an analytical function. The equivalent diameter of a particle of any shape is taken as the size of that particle. Particle shape factors are not taken into account. It is essential that the measurement technique is stated in the report in view of the dependency of sizing results of measurement principle. Samples of particles measured are intended to be representative of the population of particles. For both notation systems, numerical examples of the calculation of mean particle sizes and standard deviation from histogram data are presented in an annex. The accuracy of the mean particle size may be reduced if an incomplete distribution is evaluated. The accuracy may also be reduced when very limited numbers of size classes are employed.

ISO 9276-2:2014 Referenced Document

ISO 3534-1:2006 Statistics - Vocabulary and symbols - Part 1: General statistical terms and terms used in probability
ISO 565:1990 Test sieves; metal wire cloth, perforated metal plate and electroformed sheet; nominal sizes of openings
ISO 9276-1:1998 Representation of results of particle size analysis - Part 1: Graphical representation
ISO 9276-3:2008 Representation of results of particle size analysis - Part 3: Adjustment of an experimental curve to a reference model
ISO 9276-5:2005 Representation of results of particle size analysis - Part 5: Methods of calculation relating to particle size analyses using logarithmic normal probability distribution

2014 ISO 9276-2:2014 Representation of results of particle size analysis - Part 2: Calculation of average particle sizes/diameters and moments from particle size distributions
2001 ISO 9276-2:2001 Representation of results of particle size analysis - Part 2: Calculation of average particle sizes/diameters and moments from particle size distributions