The liquid limit is the gravimetric moisture content at which the soil changes from being plastic and starts to behave as a viscous liquid The plastic limit is the gravimetric moisture content at which a soil changes from being friable' into being plastic The plasticity index is defined as the difference between he liquid and plastic limits. Atterberg limits- The collective designation of five so called limits of consistency of fine-grained soils, suggested by Albert Atterbrg, 1911-912, but with current usage usually retaining only the liquid limit, the plastic limit, and the plasticity number (or index)• The liquid limit is the gravimetric moisture content at which the soil changes from being plastic and starts to behave as a viscous liquid. • The plastic limit is the gravimetric moisture content at which a soil changes from being ‘friable’ into being ‘plastic’. • The plasticity index is defined as the difference between the liquid and plastic limits. • Atterberg limits- The collective designation of five so￾called limits of consistency of fine-grained soils, suggested by Albert Atterbrg, 1911-912, but with current usage usually retaining only the liquid limit, the plastic limit, and the plasticity number (or index)