4. Using the experimental data, determine the Smoluchowski coagulation rate constant and the half coagulation time graphically:
Coagulation time τ, s 0 60 120 180 300 420 600
Total number of particles in 1 m 3, n⋅10 –14 20.2 11.0 7.92 6.3 4.82 3.73 2.86

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