Re: [Phys-l] thermo question

[chuck britton <britton@ncssm.edu>]

>
Saturated salt solutions maintain a 'constant' RH in a closed  
container at a given temperature.
Each salt yields a specific RH. (Something to do with the 'chemical  
potential' mu that shows up in the grand canonical ensemble, I presume)
Art conservators play this game quite seriously.

i.e. google 'humidity control salt solutions'

Various salts can be applied to large surface area zyolites to  
satisfy the most discriminating cigar connoisseur.

> On 03/03/2008 07:04 AM, fizix29@aol.com wrote:
>
> > Let me cut to the chase:
> >
> > I participate in a cigar smoker's forum and one of the topics of
> > discussion is the proper storage of cigars.? Most folks adhere to the
> > 70/70 rule, that is, 70 degrees F and 70% RH, although some claim 65%
> > is better.? Several products exist to meet these requirements, two of
> > the most popular being a mixture of distilled water and propylene
> > glycol soaked up in wet florists foam and silica gel beads that are
> > supposedly "preprogrammed" to maintain a desired RH.? These can be
> > purchased in the 65% or the 70% variety.
> ........
> > Hopefully this clarifies where I was headed with this.