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Saturday, 21 October 2017

Why Is Milk White


What is milk?

No doubt, milk has become the important component of our diet. There are many benefits of milk. We can use milk to glow our skin, to strengthen our bones and teeth, to rebuild our muscles, to lose weight, and to lower the blood pressure. As we know that milk is a white liquid and it is produced by the mammary glands of the mammals. The milk is the primary source of the nutrition for the newly born mammals because they are not able to digest the other kinds of food.


why milk is white
Why is milk white


Why the colour of milk is white?

When we see the colour of the milk, then it seems to us white. Now, a question comes to the mind that why is milk white rather than red, yellow, green or blue colour. As we know that the colour of a material depends upon the properties of the material. Therefore, before going to know about the white colour of the milk, we should try to know the composition of the milk.

The composition of the milk?

Generally, the milk is composed of carbohydrate, fat, protein, vitamins, minerals, and enzymes. When we talk about the gross composition of the milk, then we come to know that there is 87.7% water in the milk. Moreover, there is also 4.9% lactose and 3.4% fat in the milk. There are also minerals and proteins in the milk. The composition of minerals in the milk is 0.7% and the composition of proteins is 3.3% in the milk. As we know that we can get milk from a different species i.e cow, goat, sheep, and buffaloes. The composition of the milk doesn’t remain constant for all the species. This composition of milk varies to some extent from one species to the other species. It is also an interesting to know that this composition of the milk also depends upon the feed of the animals.

What is the phenomenon behind the white colour of the milk?

As we know that the colour of a material depends upon the properties of the material. This particular composition of the milk allows the milk to reflect all the visible wavelengths of light and there is no visible wavelength of the light is absorbed by the milk. The composition of all the visible wavelengths of the light provides us with a white colour of the milk.

Why is the cow’s milk yellow?

As we have discussed earlier that the colour of a material depends upon the properties of the material. The composition of the cow’s milk is that the fat particles of the cow’s milk contain colouring pigment that is called the Beta-carotene. Whereas, the buffalo’s milk doesn’t contain this colouring pigment. Due to the presence of this colouring pigment, the composition of the cow’s milk is different from the composition of the buffalo’s milk. That’s why the buffalo’s milk is white and the cow’s milk is yellowish.
The 90% of the world’s milk needs are fulfilled with the help of the cow’s milk. First of all, the cow’s milk was drunk over 10,000 years ago in Afghanistan.




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