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# absolute zero but what about max temp? watch

1. I haven't done physics for about 9 months now (but i'm still doing bio, chem and maths), but it and especially stuff to do with the universe and astronomy still fascinate me.

I know there's a minimum temperature in the universe or absolute zero ie -273*c but is there a maximum????????????
2. (Original post by Nix-j-c)
I haven't done physics for about 9 months now (but i'm still doing bio, chem and maths), but it and especially stuff to do with the universe and astronomy still fascinate me.

I know there's a minimum temperature in the universe or absolute zero ie -273*c but is there a maximum????????????
I read somewhere that it's known as 'Absolute Hot'..don't know much about it though
3. take a read http://en.wikipedia.org/wiki/Absolute_hot
4. I may be wrong, but if heat is a form of energy and our universe is more or less infinitely massive then surely if you could have an infinite amount of heat?

Edit: Touche!
5. (Original post by RWills)
I may be wrong, but if heat is a form of energy and our universe is more or less infinitely massive then surely if you could have an infinite amount of heat?
good point. People only think that the universe is infinite though don't they, has it been conclusively proven yet?
6. (Original post by Nix-j-c)
I know there's a minimum temperature in the universe or absolute zero ie -273*c but is there a maximum????????????
I haven't heard about it, but I suppose theoretically the maximum temperature obtainable would be that achieved if all the energy in the universe were conferred to a single particle. If you believe in the Big Bang, then at the very start you'd have all the energy/mass of the universe confined to small space. I guess that point at that particular time was the hottest possible and won't ever be repeated
7. (Original post by RWills)
I may be wrong, but if heat is a form of energy and our universe is more or less infinitely massive then surely if you could have an infinite amount of heat?

Edit:
Touche!
haha i'm not saying i understand it or even agree with it! in my mind i see nothing wrong with having an infinite amount of heat.... obviously some very clever people do though :s
8. Yeah I was about to say there is no absolute hot either... as long as atoms, molecules can vibrate faster and faster wouldn't that mean there's an infinite potential of heat / temperature a thing can get to
9. (Original post by Chwirkytheappleboy)
I haven't heard about it, but I suppose theoretically the maximum temperature obtainable would be that achieved if all the energy in the universe were conferred to a single particle. If you believe in the Big Bang, then at the very start you'd have all the energy/mass of the universe confined to small space. I guess that point at that particular time was the hottest possible and won't ever be repeated
hhhhmmmmmm interesting thought, I do believe in the big bang, but jsut because all that matter was in the same place at the same time, does it necessarily mean it would be oober hot?
10. (Original post by Nix-j-c)
hhhhmmmmmm interesting thought, I do believe in the big bang, but jsut because all that matter was in the same place at the same time, does it necessarily mean it would be oober hot?
Well that's when the concentration of energy would have been highest (equating energy to matter) so would be the point in time which had the highest potential temperature. Not saying that was definitely the case - I don't know; I'm just thinking out loud
11. There are a number of different theories. Our understanding of physics breaks down beyond the Planck temperature. Ultimately, the absolute upper limit of temperature is the point when all components of the system are approaching light speed. This would be approached assymptotically of course.
12. (Original post by lukejoshjedi)
Yeah I was about to say there is no absolute hot either... as long as atoms, molecules can vibrate faster and faster wouldn't that mean there's an infinite potential of heat / temperature a thing can get to
This.

That article on 'absolute hot' is just theory, not something we have any reason to believe. Where it talks about the laws of physics breaking down at the planck temperature, it doesn't give us any reason to believe that this means it can't get hotter.

As far as we know there is no maximum temperature.
13. (Original post by Chwirkytheappleboy)
Well that's when the concentration of energy would have been highest (equating energy to matter) so would be the point in time which had the highest potential temperature. Not saying that was definitely the case - I don't know; I'm just thinking out loud
who knows ?!?!?!?! Has anyone worked out what the potential temp could be? or guestimate it?
14. (Original post by thievingllama)
As far as we know there is no maximum temperature.
Well actually there is, unless you have evidence against the special theory of relativity that you would like to present to the forum?
15. (Original post by py0alb)
Well actually there is, unless you have evidence against the special theory of relativity that you would like to present to the forum?
Sorry, maybe I'm confused but you said asymptotically? i.e. particles moving at speed of light implies infinite temperature?
16. (Original post by thievingllama)
Sorry, maybe I'm confused but you said asymptotically? i.e. particles moving at speed of light implies infinite temperature?
Yes. If you do the maths you can calculate the temperature that would be equivalent to all particles in the system moving at the speed of light. That temperature can never be reached. If thats not a maximum temperature I don't know what is.

There may well be a maximum temperature below that, but we can't say so for certain within hte limitations of our current understanding.
17. (Original post by py0alb)
If you do the maths you can calculate the temperature that would be equivalent to all particles in the system moving at the speed of light.
Really? I would have thought that you'd end up with an infinite temperature since no matter how much energy you put in you'd never be able to reach the speed of light. So plotting a graph of temperature against speed, your asymptote would be at v=c on the speed axis, and the temperature axis would just fly off into infinity
18. Shouldn't that be Planck temperature?
19. its infinity and beyond
20. hhhmmmm . . . . DW I'm still following this (just about) . . . :P

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