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Grade: 12
        
is formation of malai on the surface of milk an example of adsorption??
2 months ago

Answers : (2)

Arun
23832 Points
							
Milk forms a skin on top when heated because of a chemical reaction that affects how protein and fat molecules interact with each other. Even when making tea or coffee, if you let the milk boil properly, a layer is formed.
2 months ago
Vikas TU
10600 Points
							
Dear student 
Milk forms a skin on top when heated because of a chemical reaction that affects how protein and fat molecules interact with each other. When milk is heated rapidly, some of the water in it evaporates from the surface. This exposes proteins and fat molecules, which bind and dry out as warming continues. Skin most commonly forms when milk is heated over a stove top, as stoves are generally capable of reaching very high temperatures quite quickly, though it can happen in the microwave as well. The film is not harmful, but is distasteful to many and can be prevented with constant stirring and a close eye on temperature.

When water evaporates from milk during heating, the milk’s protein and fat molecules become more condensed on the surface. Casein and beta proteins in particular tend to clump when they reach an internal temperature of around 113 to 122°F (about 45 to 50°C). As the heating continues, the soft protein layer begins to dry out, forming a skin-like film on the surface. This layer of skin forms a hard barrier, causing steam to build up, which can increase the liquid’s temperature even faster. This temperature increase is often what causes milk to boil over.
2 months ago
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