Question

Complete the following statement-
“Cow milk is an example of natural emulsion is stabilised by”

Answer 1

The colloid in which the dispersed medium is the liquid and dispersed phase is solid is known as sol. The sols are formed in the continuous liquid medium by the small solid particles. They are quite stable and show the Tyndall effect as well.

Complete step by step answer:
Emulsion is one of the types of the colloids, in which both the dispersed phase and the dispersion medium are liquid. For example: Milk, butter, hair cream etc.
The milk is an example of emulsion since both the dispersed phase and the dispersion medium are in the liquid phase only. The composition of the cow’s milk is such that it is about 87% water and the remaining 13% are the total solids including the fats,2-5%,235-9% proteins and the lactose sugar around 3-6.5% in the composition, this composition of total solid mass can vary depending on the health of the animal. Around 98% of milk is the fat of the mixture of triacyl glycerides. The presence of Casein in the milk helps to stabilise the milk naturally and the aqueous environment is stabilized through this thus making the natural emulsion.
An emulsion is formed when on agitation the two insoluble liquids agitate each other in the form of the drops, it may occur in the oil reservoir or through the pipelines as well. Emulsions show the Tyndall effect as well. The scattering of the light particles in a colloid or in a very fine suspension is known as the Tyndall effect.
Thus the cow’s milk is naturally stabilised by the emulsion process due to the presence of the Casein in it.

Note:
Emulsions have wide applications; they are used in the polymer dispersions, to prevent the coagulation of the product, they are usually used in the glues and paints as well. Such products have a wider field of applications.