Frank Grimer, Last week I tried a new setting on my spam filter which had the undesirable effect of blocking email from the vortex list. I have now read your Aug. 19 post in the vortex archives on the meaning of neutral mass.
Grimer wrote: > At 12:47 pm 24/08/2005 -0500, you wrote: >> Michael Huffman wrote: >> >>> Grimer wrote: >>> >>>> >>>> You could have added Casimir pressure for good measure. 8-) >>>> >>>> My preferred term is Beta-atmosphere since I find the analogy >>>> with atmospheric pressure useful - and it arises naturally if >>>> one starts one's analysis with sands and clays which are held >>>> together by Alpha-atmospheric pressure in the case of coarse >>>> sands (pF < 15 psi) and Beta-atmospheric pressure in the case >>>> of clays, say. (pF > 15 psi). >>> >>> Moin Frank, >>> >>> So, you are basically changing the baseline for pressure to 15psi, but >>> you do still agree with the majority of the scientific community, that >>> all pressure is positive with relation to no pressure, and that there is >>> no such thing as negative pressure with relation to no pressure. >>> >>> Knuke >>> >> >> >> Assuming negative pressure is possible, what would that imply? >> >> Harry > > > It would imply you are working from the wrong datum for zero > pressure - something analogous to working from the wrong > datum for the motion of the sun and planets or the wrong datum > for temperature. The same criticism could apply to your notions of negative and positive mass. > Historically, people have always started from an anthropomorphic > datum. It is the natural thing to do. For example, they set the > datum for temperature at O degrees Centigrade. Eventually the > maths of the relation between temperature and volume for gases > showed them what datum they should start from. This is exactly > what happened to Hewitt and I in relation to stress on concrete, > water, etc., as you will see if you care to read.... > > ================================================== > GRIMER, F.J. and R.E.HEWITT. The form of the > stress-strain curve of concrete interpreted > with a di-phase concept of material behaviour. > Structure, Solid Mechanics and Engineering Design. > Proceedings of the Southampton 1969 Civil > Engineering Conference. (M.Te'eni, Ed.), > Wiley Interscience, pp 681 - 691, 1972. > =================================================== > > ......which you will find in the "Files" section at > the following location. > > http://groups.yahoo.com/group/Beta-atmosphere_group/ > > Frank Grimer > Ok, I will have a look. Harry
