Why oil and water do not mix?

  1. Hi,

    Why do oil and water not mix? We know that some liquids mix together while others not, I am looking for the reason of this.

    Thanks to any replies
  2. jcsd
  3. mfb

    Staff: Mentor


    The attraction between two water molecules is much stronger than the attraction of a water molecule and an oil molecule (or two oil molecules), so they tend to stay together.

    You can mix them with soap (as a simplified model, long molecules where one side is attracted by water molecules and the other sticks to oil molecules).
  4. Thank you very much.
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