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Country Discussion Topics
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Need some splainin, please...
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Salmoneye    Posted 02-09-2003 at 04:09:18       [Reply]  [Send Email]
I have a running debate with a guy...This all comes from sappin' discussions...

I say...When you put a metal vessel filled with water on an open flame...The metal can never get any (not much anyway) hotter than the fluid inside it...In this case it would be appx 212 degree Farenheit...

Am I right in this, or all wet?...It was always explained to me that this is why you can use soldered pans for sugaring and not have the solder run out of the joints...

So how hot does the metal get in relation to the liquid inside?...I'll be darned if I can find anything on the net to explain this...


Drill    Posted 02-09-2003 at 08:50:12       [Reply]  [No Email]
The part of the pot up to the water level shouldn't get much hotter than the water, but any metal not covered by water could get as hot as the flame is. Iv'e seen alunimun pots melted down to the water level that were in a house fire, the bottom part was unaffected.


rhudson    Posted 02-09-2003 at 06:19:22       [Reply]  [Send Email]
the added heat energy is used to boil the water faster, not hotter. but when the cooling effect of the water is gone, the pot gets real hot real fast.

now pressure cooker are another story. water boils at an elevated temperature because of the elevated pressure. when the lid blows off... all the water in the cooker is at an elevated temperature (super heat) and instantely turns into steam at around 200 times the volume of the water. not really an explosion but close some engineers call it a "puff out".

my mother use to blow up a pressure cooker about twice a year. once so bad, the chicken she was cooking got stuck in the overhead fan grill.

later use of smoke alarms improved her cooking skills considerably.


Many Thanks!!!    Posted 02-09-2003 at 06:13:06       [Reply]  [Send Email]
I was pretty sure I was correct, but Harvey had me wondering...

I appreciate all the answers, and I hope you all have a great day!!!

Thanks!

Salmoneye


Jimbob    Posted 02-09-2003 at 05:39:20       [Reply]  [No Email]
The water will act as a heatsink & the metal will not get but a few degrees hotter that the water inside. The above assumes at atmosphere pressure & not super-steam (liquid only).


Tom A    Posted 02-09-2003 at 05:06:51       [Reply]  [No Email]
Salmoneye:

Under all "normal" conditions, you're right.

But I am pretty sure I remember from a "Heat Transfer" engineering course many years ago that there are a very few exceptions--related to ionization of materials. Only places this would apply would be in very high-speed satelites or meteors hitting the atmosphere.

If you really care about the exceptions, I can dig the book up and see if it still makes any sense. But for the most part, I'd say stick to your guns!

Tom


RAW in IA    Posted 02-09-2003 at 05:03:58       [Reply]  [No Email]
I know you can cook and such in opaoer containers, but it is not true hat the metal in a container fullof water willn ot get hotter that the water. In Nam we used to cook our C-rations over a small piece of C-4 (plastic explosive) which when lit will burn quite hot. Anyway, heating a c-ration can of water for hot chocolate, the bottomo of the can would turn blue from the heat. Definately much hotter than the wate was!


Les    Posted 02-09-2003 at 04:46:26       [Reply]  [No Email]
Of course you are right. I have boiled water in a paper milk carton.


LL    Posted 02-09-2003 at 04:58:49       [Reply]  [No Email]
Les I did not see your post when I posted below but you are correct too.


LL    Posted 02-09-2003 at 04:28:15       [Reply]  [No Email]
You are correct. I think the pot may be a degree or two hotter than 212 but not much. It was explained to me during an oxygen acetlene welding class. You and hold up a peice of paper and burn a hole in it with a cigar but put the paper on the table and you can not burn through it, you will put the cigar out first because the other side has to get hoter than the side facing the heat to melt it and other than rare cases that don't happen.


LL    Posted 02-09-2003 at 04:56:17       [Reply]  [No Email]
Also at higher altitudes it is possible to boil water in a paper bag. Try that on him.


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