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Clinical Pharmacy-Pharm D Level Three 2 Semester 2024/2025 Pharmaceutical Technology (PT 607)

5. The following data were obtained from particle size analysis for a sample
of powder by use of the microscope, calculate the mean particle diameter.

Number of particles in
Size range in micron
each size range(n)
3-4 5

4-5 10

5-6 20

6-7 50

7-8 40

8-9 15

9-10 8

Solution
Mean of size
Number of
Size range in range (d) in particles in each nd

micron micron size range(n)

3-4

4-5

5-6

6-7

7-8

8-9

9-10

99