[gmx-users] water density

[Erik Lindahl]

> If you try to simulate water in a box that is too large you'll get 
> clusters. Compare with a glass of water in a space shuttle - the water 
> won't expand to fill the entire shuttle at low density, but will form 
> a sphere in vacuum.
>

Just to clarify - usually there is of course air in the actual space 
vessel, but imagine a vacuum experiment being carried out...

Oh well, I was just trying to get rid of the gravity when explaining it 
since we usually don't have that in simultions. Hope you get the 
general idea :-)

Cheers,

Erik