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Why oil and water do not mix?

  1. Feb 17, 2013 #1

    bgq

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    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. Feb 17, 2013 #2

    mfb

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    Insights Author
    2015 Award

    Staff: Mentor

    Polarity

    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. Feb 19, 2013 #3

    bgq

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    Thank you very much.
     
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