Particle system is made up of many particles. When we speak size, we mean size of a single particle when we say particle size distribution, we mean size distribution of particle system. 
Dn50 is known as number median, it physically represents that each number of particles greater or smaller than such value takes account of 50% of the total particles number. Dv50 is also known as volume median or volume average particle size, it physically represents that each volume of particles greater or smaller than such value takes account of 50% of the total particles volume. D50 is also divided into Dv50, Dw50 and Dn50, Dv50 means volume D50, whereas Dw50 is mass D50 and Dn50 is number D50.
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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.
When we speak of D50 we mean cumulative particle size distribution D50. #SIZER DEFINITION ISO#
D50 is also named x50 or Dx50 particle size according to some ISO standards or user’s tradition. It gives operators completely same test experience and the results agrees completely with all the tested data obtained by a Fisher Scientific Sub-Sieve Sizer Model 95. HMK-22 Fisher Sub-Sieve Sizer meets the urgent requirement of the industry to find a quality successor to particle sizing technique by air permeability device such as fisher scientific model 95. HMK-22 Fisher Sub-Sieve Sizer completely meets international standards about fisher sub sieve sizers ASTM B 330 Standard Test Method for Fisher Number (FSSS) of Metal Powders and Related Compounds and ISO 10070 Metallic powders Determination of envelope-specific surface area from the measurements of the permeability to air of a powder bed under steady-state flow conditions. Fisher Model 95 Sub-Sieve Sizer uses Air Permeability Principle to fast and accurately measure the Average Particle Size i.e. HMK-22 Fisher Sub Sieve Sizer | Fisher Model 95 Average Particle Size Analysis HMK-22 Fisher Sub Sieve Sizer/Average Particle Size Analyzer (FSSS) is an optimal tool for subsieve particle size analysis and has become the best successor of discontinued Fisher Scientific Sub-Sieve Sizer (FSSS) Fisher Model 95 (Model 14-311A and older Model 14-311 Sub-Sieve Sizer). HMK-22 Fisher Sub-Sieve Sizer P/N 020198 by HMKTest AS-2011 Laser Particle Size Analyzer Video May 20 2016. AS-2011 Laser Particle Size Analyzer Image May 20 2016. ISO 11277 Soil particle size distribution test sieve. ISO 11286 Tea-Classification of grades by particle size analyzer. Carbonaceous materials laboratory vibration mill 
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