Why do oil and water not mix?

[bgq]

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

 

[mfb]

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).

 

[bgq]

Thank you very much.