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Airborne particles have irregular shapes, and their aerodynamic behaviour is expressed in terms of the diameter of an idealised spherical particle known as aerodynamic diameter. Particles are sampled and described on the basis of their aerodynamic diameter, which is usually simply referred to as particle size.Particles having the same aerodynamic diameter may have different dimensions and shapes. Details... Drug particles for pulmonary delivery are typically characterized by aerodynamic diameter rather than geometric diameter. The velocity at which the drug settles is proportional to the aerodynamic diameter, da. da = (ρ/X)1/2 * dg where ρ = density and X = shape factor. For spherical species, X = 1. Aerodynamic diameter is the diameter of a sphere of unit density (1g/cc) that has the same gravitational settling velocity as the particle in question. its given as dpa=dps x sqrt( density of particle ) Where, dps = Stoke's diameter. For more on the aerodynamic diameter of particles, see the Module 3 of the US EPA
on the characteristics of particles.
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