For a spherical particle of diameter Dp, ‚âà√≠¬¨‚àÇs is

1.	For a spherical particle of diameter D_p, ‚âà√≠¬¨‚àÇ_s is ____$
A.	0
B.	0.5
C.	1
D.	2
Answer» D. 2

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