When oil is placed on water, the water’s strong surface tension causes it to behave like a stretched elastic membrane. In contrast, oil molecules are nonpolar, with charges that are evenly distributed, resulting in a substance that lacks the electrical attraction necessary to bond with water.
How Oil Water Separation Works in Industrial Applications
To achieve a lower energy state, the substances separate, allowing the water to maintain its strong internal bonds while the oil molecules reduce their surface area contact with water. Surface Tension and Adhesion Another contributing factor is surface tension, which is the elastic tendency of a fluid surface which makes it acquire the least surface area possible.
Energy and Entropy in the Mix From a thermodynamic perspective, the separation of oil and water is driven by the system's attempt to minimize energy and maximize entropy. This process, while stabilizing the mixture temporarily, is energetically unfavorable, causing the system to seek the lowest energy state by separating the two phases.
How Oil Water Separation Works in Industrial Applications
The Science of Polarity To understand why water and oil do not mix, one must first grasp the concept of polarity. The weak interactions that could form between water and oil molecules do not release enough energy to offset this cost.
More About Why does water not mix with oil
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