Pressure in liquids

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Main Question or Discussion Point

What causes the pressure in Liquids(or gases)? Is it deep down of electromagnetic nature? By that i dont mean that there are macroscopic electromagnetic fields from a liquid under pressure but at the microscopic level the pressure is caused by electromagnetic force between the atoms/molecules of the liquid and of the surrounding media.
 

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http://en.wikipedia.org/wiki/Van_der_Waals_force" [Broken] probably account for the majority of the repulsion (& thus outward pressure) when molecules are forced together.
 
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Your question is quite interesting.

One direction to proceed to understand what systems have zero pressure?

Another point to note - apropos Jack's comment - is that most atoms in a gas/liquid are neutral. So it cant really be electromagnetic in origin. If you have a gas of neutrinos - which dont have any electric charge at all - they will still have pressure.

Hope this spurs you on a bit.
 

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