Table 1. Physical properties and Stokes number of particles with t_f = 0.01 to 0.05 s.

Particle types	ρp (g/cm3)	rp (μm)	St
Soda lime glass sphere (SGS)*	2.5	10	0.020–0.080
Glycerine-water smoke*	1.0	1.0–2.0	1.0 × 10−4–4.0 × 10−3
Pine (Pinus contorta) pollen*	1.2 (47)	20–25	0.10–0.90
Forget-Me-Not (Mimetes palustris) pollen	1.2 (47)	2.5–5.0 (48)	2.0 × 10−3–5.0 × 10−3
Wheat rust (Puccinia triticina) spore	1.0 (44)	10 (14)	0.020–0.10

*Experimented.