Re: Capillary tubes.

[brian whatcott <inet@INTELLISYS.NET>]

At 08:01 12/20/00 -0500, you wrote:
> Larry Woolf wrote:
>
> > ... Capillary action is partially responsible for liquid phase sintering of
> > materials.   According to Introduction to Ceramics by Kingery et at., "for
> > submicron particle sizes, capillaries with diameters  in the range of 0.1
> > to 1 micron develop pressures in the range of 175 to 1750 psi for silicate
> > liquids and  in the range of 975 to 9750 psi for a metal such as liquid
>
> 9750 psi is 663 atm or 504 meters of Hg (or 4.2 miles of water) !
> Amazing!
>
> P.S. Does anybody know where can such capillary tubes
> (diameter ~ 1 micron) can be purchased?
> Ludwik Kowalski


Dredging for old memories, I seem to recall that researchers who needed
 micropipettes for probing the internal electrical potential of nerves
would select giant squid axons on the one hand, and on the other, draw
out the finest possible capillary tube to a thread and snap it there.


brian whatcott <inet@intellisys.net>  Altus OK
                Eureka!