The Atterberg limits comprise the liquid and plastic limits of a soil. The liquid limit is the water content at which a soil changes from the liquid to the plastic state. It is carried out on a specimen of soil from which material larger than about 0,4 mm has been removed. Two methods can be used: the fall cone method and the Casagrande method. The plastic limit of a soil is the water content at which a soil ceases to be plastic when dried further.