Why do you think the liquids don't mix?

Liquids often don't mix due to differences in their molecular properties, such as polarity and density. Polar liquids, like water, tend to attract each other while repelling non-polar liquids, like oil, which results in distinct layers rather than a homogeneous mixture. Additionally, differences in molecular size and intermolecular forces can hinder the ability of the liquids to combine. This phenomenon is often observed in mixtures where one liquid is hydrophilic and the other is hydrophobic.