Intermolecular Forces and Surface Tension The behavior of these liquids is also governed by intermolecular forces, specifically hydrogen bonding in water. The polar water molecules attract each other so strongly that they effectively push the non-polar oil molecules away, preventing any true mixing and leading to immediate phase separation.
Pouring Oil Water Sink Demonstration: Seeing the Oil Float Live
Water is a polar molecule, meaning it has a slight positive charge on one end and a slight negative charge on the other, creating a structure that acts like a magnet. Furthermore, while the liquids appear to mix in some cases—such as when shaking a bottle—the mixture is merely a temporary suspension.
The water molecules essentially reject the oil, minimizing contact by allowing the oil to coalesce into a droplet and rest above the more cohesive water layer. 93 grams per milliliter.
Pouring Oil Water Sink Demonstration: Watch the Oil Float Up
Even in household cleaning, the separation allows for the use of degreasers that emulsify oily grime so it can be washed away with water. Water has a density of approximately 1 gram per milliliter.
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