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The impaction parameter (I) is as follows:


I = (  D2  x   Cc   x  Dp   x   V ) :  (18n  x  Do)

CC = Cunningham correction factor

DP = Density of particle

D = Diameter of particle (great importance since D2 in formula)

V = Air Velocity

n = Coefficient of Viscosity of Air

Do = Diameter of object through which particle is moving