[TheForge] Harden & temper

[Bruce Freeman]

Count yourself lucky, Frosty.  You have a tree to blame it on.  The
rest of us don't have such good excuses...

On Mon, Jun 20, 2011 at 10:21 PM, Jerry Frost <akfrosty at mtaonline.net> wrote:
> No, that's something else entirely Ron, though I can't think of the proper
> term right now (nucleation came to mind when I wrote it at the bottom of the
> paragraph). (Stupid TREE!) What's happening is the coffee is superheated in
> the microwave, (above boiling temp) but not boiling because the coffee cup
> is too smooth. The phase shift to boiling happens more easily if there're
> imperfections for bubbles to form on, then more bubbles form on the earlier
> bubbles. Clouds form in the same way humidity being above the dew point but
> dut no clouds form because condensation forms more easily on dust particles.
> (Nucleation! I just remembered, woo hoo! (Screw YOU stupid TREE)
>
> Cloud seeding occurs when planes fly a pattern in/above/upwind, etc. of
> areas with the right conditions and position. The plane carries flares that
> produce silver iodide which makes the easiest to place and more efficient
> nucleation particles. Once the first ice particles form in the super cooled
> air they quickly form nucleation sites for more and soon it's raining.
>
> Your granola bar is providing LOTS of nucleation sites for your super heated
> coffee so it boils. This can be VERY dangerous if your coffee is superheated
> more than a few degrees it won't just boil, it'll flash into steam
> violently.
>
> Nucleation isn't the only way water can boil or freeze, a sharp jolt can
> bounce the molecules off each other forming nucleation sites on everything
> in the vessel. Suddenly the coffee cup just belches boiling water all over
> the place or a beer freezes to slush with a bump on the table. Beer freezes
> more slowly with cool feather shaped ice crystals because of the alcohol and
> CO2. Cool the beer to about 28-29f and set it on the counter with a bang. Do
> NOT bang a cup of super heated water on the counter though! Fog can occur in
> air both above dewpoint and below dew temp if subjected to a strong shock,
> pressure change, etc. like the wing vortices on heavy or fast manuvering
> aircraft or a BIG explosion say a nuke for an easy example. This is a
> non-nucleated phase shift as is a soda fizzing when you open it. Fizzing is
> caused by a rapid pressure reduction, same as Mt. St. Helens or Santorini.
> and is also a non-nucleated phase change. condensation means pessure rise
> and fizz means pressure drop.
>
> On a side note; before the accident I would've had to look this stuff up for
> details even though I know what's going on. Now this stuff just rolls out,
> though I lose words, then the stupid things pop out if I just write them
> without trying to remember them. I guess there are balances for anything,
> mine seems to be better performance if I don't think about it. Well, sorta.
> <grin>
>
> Jer
> ----- Original Message -----
> From: "Ron Childers" <ron at munlaw.net>
> To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Monday, June 20, 2011 12:38 PM
> Subject: Re: [TheForge] Harden & temper
>
>
>>I thought that because when I take my coffee out of the microwave and
>> dunk a granola bar it boils instantly....
>>
>> -----Original Message-----
>> From: theforge-bounces at mailman.qth.net
>> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Lynn and Susan
>> Lang
>> Sent: Friday, June 17, 2011 6:12 PM
>> To: 'Blacksmithing List Sponsored by ABANA'
>> Subject: Re: [TheForge] Harden & temper
>>
>> Ron
>> As a sugarmaker I have experienced that sugar raises the boiling
>> temperature of water(sap) also it lowers the freezing temp of the
>> resulting Maple syrup.....
>>
>> lynn
>>
>
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-- 
Bruce
NJ