The Role of Energy: Adhesion vs. Because of this fundamental difference, the polar water molecules and the non-polar oil molecules lack the attraction necessary to mix, and instead, they cluster together with their own kind.
Why Nonpolar Oil and Polar Water Cannot Mix
This familiar phenomenon, often seen in a simple salad dressing or an oil spill on the ocean, is not just a quirky fact but a direct result of molecular polarity and the laws of thermodynamics. Cohesion The interaction between different substances is governed by the balance between adhesion (attraction between different types of molecules) and cohesion (attraction between similar molecules).
Entropy and the Drive for Order From a thermodynamic perspective, the mixing of oil and water is an unfavorable process. With water and oil, the cohesive forces between water molecules are exceptionally strong due to hydrogen bonding.
Why Nonpolar Oil and Polar Water Cannot Mix
The water molecules are more energetically stable bonding with each other than with the foreign oil molecules, effectively rejecting the oil and forcing it to coalesce into separate droplets. This polarity allows water molecules to form strong hydrogen bonds with one another, creating a cohesive and structured network.
More About Oil and water don't mix why
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