In soil particle size analysis, if D10, D30 and D60 represent particle size correspond to 10%, 30% and 60% finer than these sizes respectively, then the coefficient of
curvature is given by:
1
\(\)\(\frac{D_{30}^2}{D_{60}\times D_{10}}\)
2
\(\frac{D_{60}^2}{D_{30}\times D_{10}}\)
3
\(\frac{D_{60}}{D_{10}}\)
4
\(\frac{D_{10}^2}{D_{60}\times D_{30}}\)