How does olive oil prevent noodles from sticking?

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SUMMARY

Olive oil is added to boiling water to prevent pasta from sticking, despite its tendency to float on the surface. The physics of wetting explains that the interaction between the oil and the noodles reduces surface tension, allowing the oil to coat the noodles effectively. This process involves the principles of liquid-solid interactions, which are crucial for understanding how oil can prevent adhesion among pasta strands.

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my dad adds olive oil when boiling water for pasta, he says it's so that the noodles don't stick, but doesn't all the oil remain on the top? so even if some of the olive oil were to rub on the noodles while pouring the noodles in, wouldn't it just float to the top again? so how does olive oil prevent the noodles from sticking?
 
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Physics behind is quite involved, start here: http://en.wikipedia.org/wiki/Wetting

Note that wetting doesn't refer to interactions between just water and solid, but any liquid (be it oil) and any solid (be it noodle).
 

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