The liquid limit defined as the moisture content at which the soil passes from plastic state to liquid state, is very helpful for the classification of the potential properties of the soil material. The liquid limit gives a measure of the shearing resistance which a soil has, when mixed with water. The liquid limit of soil can be determined by Casagrande Method or Cone Penetrometer Method.
Ref. Standards: IS:2720 (Part 5), IS:9259, BS 1377