This occurs as a result of repulsion of forces. I have a perfect slide that outlines exactly why this is.
Oil molecules are nonpolar, which cannot form H-bond with water.
Water molecules around oil droplets must rearrange H-bonds to form a cage-like structure. Their orientations and movements are much restricted and so they have low entropy. The larger the oil-water interface, the lower the entropy. To maximize entropy, oil-water interface must be minimized, supporting spontaneous separation.
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Types of obligatory salt and water exchanges in a terrestrial animal.
Humpbacks frequently breach, throwing two thirds or more of their bodies out of the water and splash
Water Molecules
This lithograph by Currier and Ives gives an erroneous impression of the “battle.” Major Robert Ande
A typical purified water system
Introduction of Water to Mantle Rock