Page 96 - Practical Technology 2025

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

Problem 2
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)

2-2.5 4
2.5-3 15

3-3.5 20

3.5-4 30

4-4.5 25

4.5-5 12
5-5.5 10

Solution

Size range in
micron
2-2.5

2.5-3

3-3.5

3.5-4

4-4.5

4.5-5

5-5.5

94