279. When studying the rate of rapid coagulation of a suspension of clay in water, the following results were obtained:
τ, s 332 510 600 800
Σν*10-14, part/m3 2.52 1.92 1.7 1.49
The initial number of particles in the ash is ν0 = 5*1014 particles/m3. Calculate the half coagulation time.

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