140
3
(20 ra
sie}
100
eo
(o)
x
|
.
/
ZO
WIA
Petes
Height above ground (10° ft)
cz
Clo
WZ
0
5
25
10
15
20
Time to fall to ground (hr)
Fig. 5.
Time Required for Spherical Particles Having a 2.5 Density and a Certain Diameter to
Fall from a Given Altitude to the Ground.