In a centrifugal disc-bowl milk cream separator, the separation of fat globules from skim milk is accelerated by replacing gravity $g$ with centrifugal acceleration $r \omega^2$. Fat globules migrate toward the axis of rotation because:
Options:
(A) Milk fat has a lower density than skim milk serum
(B) Milk fat has higher electrical conductivity
(C) Milk fat is hydrophilic
(D) Skim milk serum has zero viscosity
Answer Key:
A
Step-by-Step Solution & Explanation
Milk fat globule density is $\approx 930\text{ kg/m}^3$ whereas skim milk plasma density is $\approx 1035\text{ kg/m}^3$; by centrifugal buoyant displacement, less dense fat moves inward toward the bowl center.