[TheForge] Superquench Freeze?

[Bruce Freeman]

Phlip,
The table I checked are based upon those freezing-point depression calculations, with the coefficient for sodium chloride used.  But superquench is not just brine, so I'm not sure that these tables are correct for it.
The experimental approach is the way to go, but I don't happen to have any superquench handy, so I will let someone else check.
BTW, the question is further complicated by the tendency of superquench to separate into two phases - - which may each freeze at different temperatures, for all I know.
Bruce

>>> phlip at 99main.com 12/20/2005 11:25:20 AM >>>
From: "Bruce Freeman" <FREEMAB at pt.fdah.com>
To: <theforge at mailman.qth.net>
Sent: Tue, 20 Dec 2005 09:18:48 -0500
Subject: Re: [TheForge] Superquench Freeze?

> I don't know from practical experience.  I've never seen it freeze 
> in NJ, but I may not have checked it at the right time - and NJ 
> winters are NOT like MN's!
> 
> I calculate superquench to be about 11% salt, from which tables tell 
> me it should freeze at about 20 F.  Not sure I believe those numbers,
>  though.
> 
> Bruce
> NJ

Bruce-

Couldn't you use the formula which determines the change in the molar values 
of the ingredients in water to determine the freezing point? In other words, 
if you've got X moles of solute in Y moles of solution, the important temps 
(freezing point, boiling point, vaporization point) change at a fixed rate.

Of course, me being me, I'd just get some superquench and a thermometer, 
throw it in the freezer, and check on it every so often, see if my freezer 
went down low enough to freeze it.

Phlip
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