28. Solving a chemistry problem

28. Solving a chemistry problem

94. Calculate the concentration of smoke particles at a height of 1 m, if at the initial level their concentration was 1.5·10-3 kg/m3. Average radius of particles r = 1·10-8m; density ρ = 1.2·103 kg/m3, T = 290 K; air density can be neglected.

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