Particle Technology

Particle size and distributions

Problems 2.9

Question 1
The following size distribution was obtained for glass spheres by microscope examination. Complete the table rows:

Size range (um): <5 5-7 7-10 10-15 15-20 20-30 30-40 40-50 >50
Number in range: 0 50 150 200 55 45 20 5 0
Relative number: 0 0.0952 A            
Cumulative number undersize: 0 0.0952              
Relative number per micron range: 0 0.0476              

The numerical value for item A is?
a) 0.0857
b) 0.1857
c) 0.2857
d) 0.3857

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