Is milk a homogeneous or heterogeneous mixture?

Answer
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Hint:Let us start first with definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases like oil and water they do not mix evenly, but instead from two separate layers.

Complete step by step answer:
Milk is essentially a colloidal dispersion of fat in water. Various protein and other naturally occurring surfactants the dispersion, allowing the fat droplets to remain suspended in the water without setting or coalescing. However, the fact remains that the fat and water components cannot be mixed together from a solution. There are therefore, two distinct immiscible liquid phase’s present, which is why it is a heterogeneous mixture.
Compare this with sugar in water, where the solid sugar dissolves to form a single homogenous phase that would be a homogenous mixture.
Some settling of heavier fat particles can occur, which is why you observe “top of the milk” where the creamier fraction partially separates.
Whoever, by and larger milk remains as a stable dispersion.

Additional InformationMilk, for example, appears to be homogenous, but when examined under a microscope, it clearly consists of tiny globules of fat and protein dispersed in water. The components of heterogeneous mixtures can usually be separated by simple means.

Note:
We can easily be confused between a homogenous mixture and a pure substance because they are both uniform in nature. The only difference is that the amount of solute in solvent can vary from one sample to another( for example , salt in water) but the composition of the pure substance is always the same( for example, gold).