The principle which is used to separate the cream from milk is __ .
Centrifugation
Centrifugation is a technique which involves the application of centrifugal force to separate particles from a solution according to their size, shape, and density. It is the sedimentation of particles under the influence of the centrifugal force and it is used for the separation of two miscible substances(homogeneous mixtures).
So, the principle which is used to separate the cream from milk is Centrifugation. It is also known as churning.