| -Particle Size Distribution D50 is also known as the median diameter or the medium value of the particle size distribution, it is the value of the particle diameter at 50% in the cumulative distribution. It is one of an important parameter characterizing particle size. For example, if D50=5.8 um, then 50% of the particles in the sample are larger than 5.8 um, and 50% smaller than 5.8 um. D50 is uaually used to represent the paritcle size of group of particles. |
| -Particle size distribution is the number of particles that fall into each of the various size ranges given as a percentage of the total number of all sizes in the sample of interest. |
| -Usually we use following three methods to characterize particle size distribution such as Table: percentage of particles from the total within a size range;it includes differential distribution and cumulative distribution. Figure: particle distribution by histogram and curves, etc. Function: particle distribution functionally including R-R distribution and normal distribution |
| -D50 is also named x50 according to some ISO standards. |
| -When we speak of D50 we mean cumulative particle size distribution D50. In the cumulative particle size distribution graph(curve), the ordinate represents the cumulative particle size distribution 0% to 100%, the abscissa represents the particle size, now find the cumulative distribution 50% on the ordinate, its corresponding particle size value in ordinate is D50. |
| -D50 is also divided into Dv50, Dw50 and Dn50, Dv50 means volume D50, whereas Dw50 is matter D50 and Dn50 is number D50. |
|
-When we speak size, we mean size of a single
particle; when we say particle size distribution, we mean size distribution of
particle system.
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| -Particle system is made up of many particles. In case all the particles making up particle system have same or almost same particle size we call such particle system Monodisperse however in case the particle system is made up of particles different in size, we call it Polydisperse. Size of particle system or particle diameter distribution means the regularity of the sizes of all the particles. |
| -Actually particle size distribution in
particle system is not continuous strictly speaking, however when we are
speaking a large amount of measured particles, we can say it is continuous. The
size distribution of polydisperse particle system made up of particles in
different sizes is divided into Unimodel and Multimodel. |
