Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where Nₛₜ is the Stokes number)

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Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where Nₛₜ is the Stokes number) Answer: ηᵢₘₚ = 0.075Nₛₜ¹⋅²

Question context

This question is part of ⚗️ Biochemical Engineering within the broader 🧬 Medical Science subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.