Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle and D = equivalent diameter of particle).

A. $$\frac{{6{\text{V}}}}{{{\text{D}}.{\text{S}}}}$$

B. $$\frac{{\text{V}}}{{6{\text{D}}.{\text{S}}}}$$

C. $$\frac{{{\text{D}}.{\text{S}}}}{{\text{V}}}$$

D. $$\frac{{\text{V}}}{{{\text{D}}.{\text{S}}}}$$

Answer: Option A