Activity 2.5 NCERT Class 9 Science Chapter 1 Is Matter Around Us Pure
Brief procedure:
Activity 2.5 asks us to separate cream from the milk by centrifugation.
Observation/finding:
Centrifugation of the milk separates them into skimmed milk and cream at the top.
Explanation:
Components of a mixture may have different densities. When such a mixture is shaken vigorously, lighter particle separates from the rest and float on the surface. Milk fats are lighter than the rest of the mixture. As a result when we shake milk vigorously milk fat separate and start floating on the surface.
Inference /conclusion:
We can separate components of a mixture by centrifugation if the components of the mixture have different densities.
Application:
Separation of components from the blood in pathological testing.
Preparation of butter from the milk.
Next: Separation of immiscible liquid, class 9 Science activity 2.6.
See also: Experiment to demonstrate the separation of a mixture by evaporation, Activity 2.4.
