Instead of bonding with the oil, water molecules prefer to stay bonded to other water molecules, maximizing their hydrogen-bonding network. To understand why these two common liquids are incompatible, we must look at the invisible forces that govern their behavior.
How Cohesive Forces Keep Water and Oil Apart
Common examples include lecithin found in egg yolks, which allows for the creation of stable vinaigrettes, and bile salts in the human digestive system, which enable the absorption of dietary fats. Water and oil refuse to mix, a familiar observation that underpins everything from a simple salad dressing to the complex chemistry of cellular life.
Because the water cannot form stabilizing interactions with the oil, the system gains no energy to offset this cost. When oil is introduced to water, the water molecules must disrupt their ideal hydrogen-bonded lattice to accommodate the non-polar oil molecules.
How Cohesive Forces Keep Water and Oil Separated
Water is a classic example of a polar molecule; its structure is bent, creating a distinct positive charge on the hydrogen atoms and a negative charge on the oxygen atom. This polarity allows water molecules to form strong attractions with other polar substances or ions, creating a tight network of hydrogen bonds.
More About Why water and oil does not mix
Looking at Why water and oil does not mix from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Why water and oil does not mix can make the topic easier to follow by connecting earlier points with a few simple takeaways.
