Logarithmic Standard Deviation - 2nd moment
Description
Shows how much variation or dispersion from the average exists. Logarithmic mean size (1st moment) needs to be precalculated.
Related formulasVariables
| σ_ϕ | Logarithmic Standard deviation - 2nd moment (dimensionless) |
| fi | Cumulative weight percent of the i- particle size grade present (dimensionless) |
| mi | Mid-point of the i- particle size grade present (dimensionless) |
| X_ϕ | Logarithmic Mean Size - 1st moment (dimensionless) |
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External links