Aw Shucks, I was thinking of getting a couple of 1/2 gallon paint cans and reworking the lids, adding the membrane with the hole in it and using a variac.
Here's an article on bubbles that covers them quite well: http://www.physicstoday.org/pt/vol-56/iss-2/p36.html On Dec 26, 2007 6:02 AM, R.C.Macaulay <[EMAIL PROTECTED]> wrote: > Don't attempt this experiment without a blast shield and a heat shield > suit. > Richard > > ----- Original Message ----- > *From:* Frederick Sparber <[EMAIL PROTECTED]> > *To:* [email protected] > *Sent:* Wednesday, December 26, 2007 6:02 AM > *Subject:* Re: [Vo]:Re: Making Bubbles With Heat > > Now for the big question. Do you put a coil of heater wire in the liquid, > or will > two large chambers (vertical, > 10 centimeter diameter) separated by a > 0.25 cm thick insulating plate-membrane with a 2 square centimeter area (~ > 5/8 inch diameter hole) in it form bubbles in the constricted area using > saltwater or LiOH, K2CO3, or such with a 70 ohm-cm electrolyte (about 9 ohms > resistance) and voltage applied between the two conductive chambers? > > At 120 volts that comes out to over a kilowatt dumped into the constricted > zone. > > Ness Engineering's "liquid resistors" data sheets give information on the > electrolyte strength > for various salt solutions. > > * **http://home.san.rr.com/nessengr/* <http://home.san.rr.com/nessengr/> > > On Dec 26, 2007 3:58 AM, Frederick Sparber <[EMAIL PROTECTED]> wrote: > > > When clear Pyrex glass coffee pots came out after WWII it was quite a > > show watching > > the bubbles form when the pot was in direct contact with the hot-plate > > heater coils. > > > > *http://wins.engr.wisc.edu/teaching/mpfBook/node27.html*<http://wins.engr.wisc.edu/teaching/mpfBook/node27.html> > > > > "Vapor may form from a liquid (a) at a vapor-liquid interface away from > > surfaces, (b) in the bulk of the liquid due to density fluctuations, or (c) > > at a solid surface with pre-existing vapor or gas pockets. In each situation > > one can observe the departure from a stable or a metastable state of > > equilibrium. The first physical situation can occur at a planar interface > > when the liquid temperature is fractionally increased above the saturation > > temperature of the vapor at the vapor pressure in the gas or vapor region. > > Thus, the liquid "evaporates" into the vapor because its temperature is > > maintained at a temperature minimally higher than its vapor "saturation" > > temperature at the vapor system pressure. Evaporation is the term commonly > > used to describe such a situation which can also be described on a > > microscopic level as the imbalance between molecular fluxes at these two > > distinctly different temperatures." > > > > ------------------------------ > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 269.17.8/1196 - Release Date: > 12/25/2007 12:18 PM > >
