What is the coldest fire?
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Rohde wrote:
In the EM
In the visible EM range.
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Well, since black technically isn't a colour, it really isn't correct to say it's the coldest colour...in a way.
not *that* discussion again... :rolleyes:
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Bassam Abdul-Baki wrote:
Another question is how cold is the coldest color.
Black should be the coldest color, as it's the absence of color, which also means the absence of electromagnetic radiation.
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You're on glue.:-D Black absorbs light from every spectrum making it quite hot. White is the coolest color as it reflects light from almost all spectrums. Hence people wear white to stay cool.
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If paper burns at some temperature and coal and gas at another, what is the object that gives the coldest fire? Another question is how cold is the coldest color. I believe different colors represent different temperatures.
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Color alone isn't the best way to get your answer. Color's interact with light and absorb or reflect heat. Black will be the hottest as it absorbs light from every spectrum. Moving towards white will be cooler and hence white is the coldest color. No coincidence that snow is white but when it's warm it's clear and deep water looks black. Since a flame can only be produced in the presence of oxygen the coolest flame will present in the least amount of oxygen that can still burn. Once you have established a ceiling for oxygen then find gases that have the lowest "flash-point".
"You have an arrow in your butt!" - Fiona:cool:
Welcome to CP in your language. Post the unicode version in My CP Blog [ ^ ] now.People who don't understand how awesome Firefox is have never used CPhog[^]CPhog. The act of using CPhog (Firefox)[^] alone doesn't make Firefox cool. It opens your eyes to the possibilities and then you start looking for other things like CPhog (Firefox)[^] and your eyes are suddenly open to all sorts of useful things all through Firefox. - (Self Quote)
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You're on glue.:-D Black absorbs light from every spectrum making it quite hot. White is the coolest color as it reflects light from almost all spectrums. Hence people wear white to stay cool.
"You have an arrow in your butt!" - Fiona:cool:
Welcome to CP in your language. Post the unicode version in My CP Blog [ ^ ] now.People who don't understand how awesome Firefox is have never used CPhog[^]CPhog. The act of using CPhog (Firefox)[^] alone doesn't make Firefox cool. It opens your eyes to the possibilities and then you start looking for other things like CPhog (Firefox)[^] and your eyes are suddenly open to all sorts of useful things all through Firefox. - (Self Quote)
Surely, you're talking about the objects rather than their colors, right? If you dress in reflective white, and you let the white light bounce off onto me (all dressed in black), I will surely heat up, because of the hot white light. The fact that I get hot has nothing to do with the light I emit, but what I can absorb. But then again, I've been wrong before. :)
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Color alone isn't the best way to get your answer. Color's interact with light and absorb or reflect heat. Black will be the hottest as it absorbs light from every spectrum. Moving towards white will be cooler and hence white is the coldest color. No coincidence that snow is white but when it's warm it's clear and deep water looks black. Since a flame can only be produced in the presence of oxygen the coolest flame will present in the least amount of oxygen that can still burn. Once you have established a ceiling for oxygen then find gases that have the lowest "flash-point".
"You have an arrow in your butt!" - Fiona:cool:
Welcome to CP in your language. Post the unicode version in My CP Blog [ ^ ] now.People who don't understand how awesome Firefox is have never used CPhog[^]CPhog. The act of using CPhog (Firefox)[^] alone doesn't make Firefox cool. It opens your eyes to the possibilities and then you start looking for other things like CPhog (Firefox)[^] and your eyes are suddenly open to all sorts of useful things all through Firefox. - (Self Quote)
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Surely, you're talking about the objects rather than their colors, right? If you dress in reflective white, and you let the white light bounce off onto me (all dressed in black), I will surely heat up, because of the hot white light. The fact that I get hot has nothing to do with the light I emit, but what I can absorb. But then again, I've been wrong before. :)
Surely I'm just harassing you. I've never had a chance to say you are on glue and this was my first opportunity (even though it was weak on my part :) ) I had to make an attempt. :laugh:
"You have an arrow in your butt!" - Fiona:cool:
Welcome to CP in your language. Post the unicode version in My CP Blog [ ^ ] now.People who don't understand how awesome Firefox is have never used CPhog[^]CPhog. The act of using CPhog (Firefox)[^] alone doesn't make Firefox cool. It opens your eyes to the possibilities and then you start looking for other things like CPhog (Firefox)[^] and your eyes are suddenly open to all sorts of useful things all through Firefox. - (Self Quote)
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Surely I'm just harassing you. I've never had a chance to say you are on glue and this was my first opportunity (even though it was weak on my part :) ) I had to make an attempt. :laugh:
"You have an arrow in your butt!" - Fiona:cool:
Welcome to CP in your language. Post the unicode version in My CP Blog [ ^ ] now.People who don't understand how awesome Firefox is have never used CPhog[^]CPhog. The act of using CPhog (Firefox)[^] alone doesn't make Firefox cool. It opens your eyes to the possibilities and then you start looking for other things like CPhog (Firefox)[^] and your eyes are suddenly open to all sorts of useful things all through Firefox. - (Self Quote)
Heh, I'm pretty bad to recognize when people are messing with me, when all I've got to go on is text. Might be a reason why I always get so wound up in arguments. :~ I want facial expressions and hear the pitch and tones of voice! :-D
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By definition: Temperature is the measure of heat ENERGY. The lower the tempurature - the less heat energy. Liquid Hydrogen and oxigen released at a controlled rate at its evaporation point will burn the coldest flame because of it being so cold to begin with. Also, because of of the minimal energy output you will not see any light, so that is your coldest color - no light. Light and heat are both energy and the least energy is the absence of energy. The flame from the space shuttle (not the boosters) is a very thin light blue, but that is at an extreme rate of burn, not the whisper of flame that I am talking about in a dark and very cold room. Also, you have your spectrum backwords - Red light is hotter than blue - There is more energy in red light (The sun feels hot). On objects - black absorbs energy and white reflects it, but clear glass lets it pass thru - so once again - no color is the coolest. I hope this doesn't throw a monkey wrench into this discussion.:suss:
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By definition: Temperature is the measure of heat ENERGY. The lower the tempurature - the less heat energy. Liquid Hydrogen and oxigen released at a controlled rate at its evaporation point will burn the coldest flame because of it being so cold to begin with. Also, because of of the minimal energy output you will not see any light, so that is your coldest color - no light. Light and heat are both energy and the least energy is the absence of energy. The flame from the space shuttle (not the boosters) is a very thin light blue, but that is at an extreme rate of burn, not the whisper of flame that I am talking about in a dark and very cold room. Also, you have your spectrum backwords - Red light is hotter than blue - There is more energy in red light (The sun feels hot). On objects - black absorbs energy and white reflects it, but clear glass lets it pass thru - so once again - no color is the coolest. I hope this doesn't throw a monkey wrench into this discussion.:suss:
Good explanation. I've always known that the process of burning was the same for hot and cold. But the question that comes up now, since liquid hydrogen and oxygen are freezing temperatures and fire is extremely hot, is there a continuous line between those two temperatures for burning. Otherwise, my original question is still valid. What is the coldest fire and add to it what is the hottest evaporation rate for liquid gases?
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