Arithmetic Standard Deviation - 2nd moment
Description
Shows how much variation or dispersion from the average exists, on the particles’ size distribution of a soil, in metric scale. Arithmetic mean size (1st moment) needs to be precalculated.
Related formulasVariables
σa | Arithmetic Standard Deviation - 2nd moment (mm) |
fi | Cumulative weight percent of the i particle size grade present (dimensionless) |
mmm | Mid-point of the i particle size grade present (mm) |
Xa | Arithmetic mean size - 1st moment (mm) |
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External links