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Sunday, March 14, 2004 1:36 PM, John Denker wrote:
It *is* possible to have negative pressure in a liquid. I
get 600 hits from
http://www.google.com/search?q=homogeneous-nucleation+liquid+bubble
Such a state is only metastable against phase-separation.
But sometimes metastability is good enough. A "D" battery is
at best metastable against self-discharge, but people buy "D"
batteries all the time.
Siphoning in a vacuum is presumably somewhat tricky, but I
would not be at all surprised to see it done. I can't think
of any law of physics that would prevent it.
According to the (1), the maximum lenght of the short arm is the____________________________________________________
barometric height of used liquid and a siphon would not work in
vacuum.
According to the (2), for a very cohesive liquid, the maximum lenght
can be bigger than the barometric height and a siphon would work in
vacuum.