[TheForge] Harden & temper

[Jerry Frost]

Think I haven't been using hell out of the excuse? You aught to see the 
reactions I get when I play my little touch my dent joke and then shreik OW! 
if they do.

Jer
----- Original Message ----- 
From: "Bruce Freeman" <freemab222 at gmail.com>
To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, June 21, 2011 4:49 AM
Subject: Re: [TheForge] Harden & temper


> 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
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