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On Fri, 6 May 1994 lanier@ex*.cs*.ti*.co* wrote:

> Hold on a second here - I don't believe there is any significant amount of 
> gas in this "bubble" in the syringe in the above example.  That is a 
> "vacuum" bubble.  Given time the bubble will fill with gas from the liquid 
> beneath, but there is hardly time for this to occur in this example or in 
> joint cracking.  If you see bubbles forming within the liquid volume (as in 
> boiling), then you have gas.  A bubble temporaily formed at the top surface 
> is essentially vacuum.

But, if the "vacuum bubbles" were truely vacuums, they would instantaneously
vanish when exposed to any ambient pressure.  Aren't the bubbles in the above
example formed by "pulling" dissolved gas molecules out of solution?

Aloha,

Rich

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