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There are two major techniques of particle size distribution:
(i) Sieve analysis – for soil particles larger than 60?m they can be separated by this method.
(ii) Sedimentation analysis – for soil particles smaller than 60?m, they are too small to be sieved by sieve analysis. Instead, the particle size distribution is worked out from the rate of settlement of soil particles suspended in water by Stoke’s law.
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.