why oil floats on water?

Because oil is less denser than water water is very denser so it goes down, oil is less denser so it goes up and floats in water. or other reason can be:- Oil has different dipole moments than water, meaning that their molecules do not attract. This means that they don't dissolve in each other. Oi

it is because of difference in density two due to which they do not mis with each othe