Question

in a mixture of oil and water, why does oil always form a layer on the top of water?​

Answer 1

Explanation:

First you should have noticed that when you added the oil to the water they did not mix together. Instead the oil created a layer on the surface of the water. This is because oil is less dense than water and therefore it floats to the surface.

Answer 2

Answer:

In mixture of oil and water oil always form a layer on the top of water as it is less denser than water and hence always floats over it

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