Grain size analysis of soil is done in two stages.
1. Sieve Analysis
2. Sedimentation Analysis
Sieve Analysis is carried out for coarse grained soils (grain size greater than 0.075mm) and is done using different sized sieves.
Whereas fine grained soils grain analysis (grain size less than 0.075mm) is done by Sedimentation Analysis, which is done by Hydrometer Method or Pipette Method.