Question

Which separation method is based on gravity?

Answer 1

Sedimentation and decantation involve the principle of gravity. In the sedimentation method, the heavier solid particles settle down to the bottom of water under the effect of gravity.
In the decantation method, two immiscible liquids, when kept at rest in a container, form two distinct layers, due to differences in density.
It can be separated by pouring out the clear upper layer of liquid.