Question

How can the two properties like plasticity and cohesion help a potter?

Answer 1

Plasticity is a soil property which enables a moist soil to change shape
on an applied force and retain this shape even when the force is withdrawn. Thus sandy soils are
considered as non-plastic and clayey soils as plastic. Cohesion, on the other hand, is a property
of the particles to stick to one another by cohesive force. Plastic soils are cohesive. Plasticity and
cohesion reflect the soil consistency and workability of the soils. Black soils are highly plastic
and highly cohesive making tillage operation difficult.