High Quality Content by WIKIPEDIA articles! Sphericity is a measure of how spherical (round) an object is. As such, it is a specific example of a compactness measure of a shape. Defined by Wadell in 1935, the sphericity, ?, of a particle is the ratio of the surface area of a sphere (with the same volume as the given particle) to the surface area of the particle: Psi = frac{pi^{frac{1}{3}}(6V_p)^{frac{2}{3}}}{A_p} where Vp is volume of the particle and Ap is the surface area of the particle.

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