Particle Technology

Particle size and distributions

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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	0.2857	0.3810	0.1048	0.0857	0.0381	0.0095	0
Cumulative number undersize:	0	0.0952	A
Relative number per micron range:	0	0.0476

The numerical value for item A is?
a) 0.0810
b) 0.1810
c) 0.2810
d) 0.3810

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