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Why the mixture of water and oil shouldn't evaporate?
I've learned that the evaporation of a liquid is a result of kinetic energy. That is, if I dip an object in water, the object tends to vibrate slightly to increase the amount of kinetic energy.
Now if I pour oil in water, then the oil has more kinetic energy than the water, so its molecules are moving slightly faster.
However, I learned that as soon as I place the oil in the water, both start moving much faster, and the water gets evaporated.
But I was told that in order to increase kinetic energy, molecules should collide with each other (according to the conservation of energy). Now how can the oil molecules collide with each other in the water? How come the mixture of water and oil doesn't evaporate?
A:
Think of water. It is really a liquid made of a few gases dissolved in water. The gases are so light that you couldn't even push them around with a pencil. The only way you can get kinetic energy out of them is by heating them. You can do the same with oil. While you're heating it up, it gets lighter and the molecules get more energetic.
What really happens in an oil-water mixture is exactly what you've just described. In the beginning, when the oil is be359ba680
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