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 ============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College lectures, archives, unsubscribe, maps at http://www.friam.org
