Posted by
lrudolph on
Jul 04, 2011; 4:06pm
URL: http://friam.383.s1.nabble.com/Experiment-and-Interpretation-tp6544946p6546691.html
Peter Lissaman writes, in relevant part:
> Incidentally, with reference to some discussions of high and low
> pressures at surfaces: ALL free surfaces for ANY fluid motion with
> stationary air as the contiguous external fluid are at the same
> CONSTANT pressure. How could they be otherwise?
But, with discontiguous bodies of stationary air (e.g.,
(1) the large body containing the air in the kitchen or
bathroom where Nick has his sink, along with most of the
rest of the terrestrial atmosphere, and (2) the air
trapped between either (a1) the plug, or (a2) the lower
surface of the water in Nick's sink, at the moment
when he pulls the plug, and (b) one of the two free
surfaces of the standing fluid--greasy water--in
the U-bend of the grease trap), there can be (for
a while) DIFFERENT constant pressures at different
internal/external fluid interfaces--no?
This is (what I would call) a question asked personally
(though not privately), but if I receive neither a private
nor a public answer, I will simply conclude that you draw
the distinction between "personally" and "privately"
differently than I do.
Lee Rudolph
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