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Talk about the difference between the clay-size particle or clay minerals.

Please remind students about the oxymoron of the cohesion and cohesionless.

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Mention sieve analysis and hydrometer analysis for different size of soils

There is not distinguish for silt and clay in the USCS system.

It is not necessary to use the full set of sieves, but the particle size should be distinguished.

Wet sieving:

According to the British standard, dry sieving may be carried out only on materials for which this procedure gives the same results as the wet-sieving procedure. This means that it is applicable only to clean granular materials, which usually implies clean sandy or gravelly soils-that is, soils containing negligible amounts of particles of silt or clay size. Normally the wet-sieving procedure (section 4.6.4) should be followed for all soils (Head, 1992).

Effective size (D10): This parameter is the diameter in the particle-size distribution curve corresponding to 10% finer. The effective size of a granular soil is a good measure to estimate the hydraulic conductivity an ddrainage through soils.