bioLarzen
Demi-Minion
"I reject your avatars and substitute my own."
Posts: 86
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Post by bioLarzen on Nov 28, 2012 10:53:16 GMT
We have a theoretical lowest temperature: 0 Kelvin. There can be no lower temperature than that. Understood.
But do we have a theoretical maximum temperature?
I have the feeling I'm asking nonsense again, but I figured it was worth a try.
bio
{Moved to Oracle as this is a science question not a show idea - CM}
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Post by freegan on Nov 28, 2012 16:13:05 GMT
If you can calculate the quantity of all the energy contained within the Universe and re-calculate that as contained within a sphere of one Planck-length diameter, then you will have your answer. I'm afraid I don't have all the relevant data or the inclination to research the necessary math, but feel free ...  |
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bioLarzen
Demi-Minion
"I reject your avatars and substitute my own."
Posts: 86
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Post by bioLarzen on Nov 28, 2012 22:51:08 GMT
If you can calculate the quantity of all the energy contained within the Universe and re-calculate that as contained within a sphere of one Planck-length diameter, then you will have your answer. I'm afraid I don't have all the relevant data or the inclination to research the necessary math, but feel free ... Thanks - but what I really wanted to know if there is an upper limit to temperature, not the figure itself. So, you've fully answered the question. bio |
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Post by freegan on Nov 29, 2012 0:00:50 GMT
Apparently (pp13+14 of link), the value of the hottest theoretical temperature is 1.41679 x 10 32K and is known as the Planck Temperature.
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bioLarzen
Demi-Minion
"I reject your avatars and substitute my own."
Posts: 86
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Post by bioLarzen on Nov 29, 2012 10:31:43 GMT
Thanks!
that's pretty hot - even in the shadows, i presume...
bio
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Post by silverdragon on Nov 30, 2012 7:51:55 GMT
So stay out of the shadows?....
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Post by craighudson on Nov 30, 2012 8:05:16 GMT
...except in the shadows it will be absolute zero. In fact it will be absolute zero everywhere in the universe except in the region of dimensions equal to one Planck length which is at the Planck temperature.
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Post by freegan on Nov 30, 2012 8:58:23 GMT
...except in the shadows it will be absolute zero. In fact it will be absolute zero everywhere in the universe except in the region of dimensions equal to one Planck length which is at the Planck temperature. The region of dimensions equal to one Planck length at the Planck temperature will be the entire Universe, as it was at the moment of the 'Big Bang'. [/pedantry] |
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Post by silverdragon on Nov 30, 2012 9:00:14 GMT
The Shadows have never been the same since Cliff left..........
But that cold?....
Ok, so, here is a question.
The dark side of the planet Mercury, or any plant close to any "sun" style star, "In the shadows", how "warm" (when compared to absolute zero) will it be when you start to enter the shadows caused by the planet?....
Will there be any radiated heat from the sun still present as you enter the shadow, and how much will that be dependant on how close you are to the Planet and any possible effect from any atmosphere..........
I ask because I just dont know, I havnt actually though this through, but heck, its worth the finding out?....
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Post by silverdragon on Nov 30, 2012 9:03:41 GMT
Addition....
How close can you get to the sun, in "space", before it starts to get warm anyway?....
Take some form of space craft that has shielding on the sun-wards side that prevents heat transfer, and a thermometer on the shadow side and send it sun-wards, how close before the temp raises above absolute zero?...
Do you have to hit the suns "Atmosphere" kind of thing?....
(Where atmosphere is that big cloud of boiling burning gas)
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Post by silverdragon on Nov 30, 2012 9:06:53 GMT
(Three posts because of different subjects....)
Hottest.
I am suggesting that the hottest thing you can possibly get will be the temp of the combustion of known material.
So what known material burns at the hottest temp?...
IS it Thermite?... or is there something hotter?... (If in doubt, combustion of C4 temp...)
How "Hot" can you get in an explosion?...
How "Hot" is a NUCLEAR explosion?...
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Post by freegan on Nov 30, 2012 9:56:18 GMT
The dark side of the planet Mercury, or any plant close to any "sun" style star, "In the shadows", how "warm" (when compared to absolute zero) will it be when you start to enter the shadows caused by the planet?.... Will there be any radiated heat from the sun still present as you enter the shadow, and how much will that be dependant on how close you are to the Planet and any possible effect from any atmosphere...... If you enter Mercury's umbra (as opposed to penumbra, where a portion of the Sun is still visible) there will be no direct radiation from the Sun. Mercury, however, although it has no appreciable atmosphere will radiate some heat. It used to be thought that Mercury didn't rotate with respect to the Sun and kept the same face toward it. That has since been shown to be untrue and its 'day' is c88 Earth days in length. Whilst the daylight side reaches around 425 oC its night side can drop to -180 oC. That range should allow you to adopt a comfortable point over which to hover, provided that you can control your 'orbit'. [Edited thanks to SailorQwest's link correcting my error - 800 oF = 425 oC] |
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bioLarzen
Demi-Minion
"I reject your avatars and substitute my own."
Posts: 86
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Post by bioLarzen on Nov 30, 2012 11:00:13 GMT
(Three posts because of different subjects....) Hottest. I am suggesting that the hottest thing you can possibly get will be the temp of the combustion of known material. I'd think the hottest known material would be some kind of plasma - but then what do I know about this... bio |
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Post by sailorqwest on Nov 30, 2012 22:33:39 GMT
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bioLarzen
Demi-Minion
"I reject your avatars and substitute my own."
Posts: 86
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Post by bioLarzen on Dec 1, 2012 0:16:44 GMT
Yeah, just read it yesterday. Great stuff. bio |
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Post by GTCGreg on Jan 5, 2013 6:16:00 GMT
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Post by freegan on Jan 5, 2013 12:29:03 GMT
The original press release from Max-Planck-Gesellschaft explains "At first sight it may sound strange that a negative absolute temperature is hotter than a positive one. This is simply a consequence of the historic definition of absolute temperature, however; if it were defined differently, this apparent contradiction would not exist." Seems to me that a paradigm shift is overdue when our current one produces such paradoxes as a temperature hotter than infinite.
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