Water is a polar molecule with strong hydrogen bonds, giving it high surface tension. Oil is nonpolar with weaker intermolecular forces. They have different cohesive forces and weak adhesive forces between them, causing them to minimize contact area. This tendency to minimize interfacial area is a manifestation of interfacial tension, which is related to the surface tensions of the individual liquids and their interactions.
Oil and water do NOT mix because of the property of
Asked in UPSC CAPF 2020 · Topic: Physical Properties of Materials (Viscosity and Surface Tension)
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