Discussion
Particulate of density \( 2000 \) kg/m\(^3\) and physical diameter \( 5 \) micrometres has an aerodynamic diameter of about
Answer: A
Aerodynamic diameter scales as the physical diameter times the square root of the density ratio, so \( 5\sqrt{2} = 7.07 \) micrometres. A dense particle therefore behaves like a larger one in both the lung and a control device.
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