# Behaviour of liquid in vaccume

Is it possible for a liquid to exist in a high quality vacuume? For example, a few Torr.

If so what are the methods for doing this?

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What is "quality" of a vacuum? What makes that quality "high"? –  Georg Sep 16 '11 at 9:36
Means good vaccume like outer space. –  Zain Sep 16 '11 at 9:40
Aha, and that "outer space" is "a few" Torr? –  Georg Sep 16 '11 at 9:43
Assume it 0 or few torr. –  Zain Sep 16 '11 at 9:50
Asside: A few Torr is not a particularly good vacuum (only $10^{-3}$ Atm), nuclear and particle physicist use vacuums at or below $10^{-6}$ Atm on a regular basis. –  dmckee Sep 16 '11 at 14:59

Looking at the triple points (a good estimate of the lowest pressure at which the liquid is stable) for a variety of liquids, you can see that mercury for example (it's in this pdf, I promise) has its triple point at -38 C and ~$10^{-6}$ Torr. In other words, liquid mercury is thermodynamically stable near this pressure and temperature and can thus certainly be stable at a pressure of a few Torr.