Absolute HOTNESS!!

[El_Machinae]

I answered Fifty's question, above, but it might be lost in the cross-posting.

There shouldn't be anywhere natural near Absolute Zero; the background radiation keeps everything in the universe decently warm.

 

[Xanikk999]

I answered Fifty's question, above, but it might be lost in the cross-posting.

There shouldn't be anywhere natural near Absolute Zero; the background radiation keeps everything in the universe decently warm.

Even in interstellar space lightyears beetween any stars?

What about interstellar inbeetween galaxies, which could be hundreds of thousands of lightyears inbeetween a heat source.

 

[Mise]

Even in interstellar space lightyears beetween any stars?

What about interstellar inbeetween galaxies, which could be hundreds of thousands of lightyears inbeetween a heat source.

The "heat source" is the big bang itself - cosmic background radiation left over from the big bang permeates free space.

 

[von_Seydlitz]

Even in interstellar space lightyears beetween any stars?

What about interstellar inbeetween galaxies, which could be hundreds of thousands of lightyears inbeetween a heat source.

The intergalaxy-space has still a rate of particles of something closely under 1/m³, afaik.

 

[skadistic]

Fine. Even if something can travel faster than light; only if it can approach infinity will it be an element in the question on Maximum Temperature.

Do you believe that there is a maximum speed (faster than the speed of light) ?

Nope. There are no limits other then the ones we limit our selves too. They use to say man could never break the speed of sound. Just because man thinks there is a limit to speed dopesn't mean there is.

 

[von_Seydlitz]

Yes, that's correct. Certain anomalies show that todays standard physics can't be capable to explain the universe as physicists always claimed it would, anyway.

 

[Xanikk999]

Nope. There are no limits other then the ones we limit our selves too. They use to say man could never break the speed of sound. Just because man thinks there is a limit to speed dopesn't mean there is.

But we have a much better understanding of physics now.

I like your attitude, but its impossible to go faster then the speed of light end of story.

 

[skadistic]

But we have a much better understanding of physics now.

I like your attitude, but its impossible to go faster then the speed of light end of story.

Prove it. Go as fast as light and not go any faster. Yes we have a better understanding but its still very inmature. What we thought we knew 50 years ago to be absolute isn't anymore.

 

[NKVD]

Prove it. Go as fast as light and not go any faster. Yes we have a better understanding but its still very inmature. What we thought we knew 50 years ago to be absolute isn't anymore.

you asking him to prove that here lol you're funny...

I'm not a physicist but here what I think

anyway to the OP:

Basically, the First Law of Thermodynamics is a statement of the conservation of energy - the Second Law is a statement about the direction of that conservation - and the Third Law is a statement about reaching Absolute Zero (0° K).

You cannot create heat from nowhere...you have to take it from somewhere and the energy have to come from somewhere like a collision. Because of the entropy of the universe nothing can be hotter than the Big Bang and all temperature will go down and down until the end of time (what we call heat death of the universe) :

The 'heat-death' of the universe is when the universe has reached a state of maximum entropy. This happens when all available energy (such as from a hot source) has moved to places of less energy (such as a colder source). Once this has happened, no more work can be extracted from the universe. Since heat ceases to flow, no more work can be acquired from heat transfer. This same kind of equilibrium state will also happen with all other forms of energy (mechanical, electrical, etc.). Since no more work can be extracted from the universe at that point, it is effectively dead, especially for the purposes of humankind.

so i would say no there is no maximum but the bigbang was the hottest

 

[skadistic]

you asking him to prove that here lol you're funny...

st

Not literaly prove it. I was just making the point that its all theory.

 

[Cheezy the Wiz]

Kinda off topic, but whats the closest people have gotten to absolute zero and is it even possible to reach absoulte zero.

AND IS there even anywhere where absolute zero exists in the universe?

Maybe interstellar space but even there i didnt think so.

We have gotten within a few thousandths of a degree of absolute zero, but -273 C cannot be obtained.

Allow me to explain.

In order for you to reach absolute zero, you must attain a temperature that is lower than absolute zero, which is impossible. This is because, in order for something to cool down, it has to have a colder place for its energy to flow to. Thus, to attain absolute zero, which is when particles stop moving, you must have a place for the energy of those particles to go, which means negative velocity, and that's impossible, without going backwards in time.

There's a mathematical way to show this, probably with one of the formulas that invloves heat. Maybe a physics major can show this? I don't feel like digging out my physics notes from high school.

The answer to your third question should be apparent, no place in the universe it at absolute zero, but some places are damn near close.


EDIT: Okay, so i went and found my old notes. The equation is Delta u=Q+W

Delta u is net energy (basically, it is the temperature) in Kelvins
Q is Heat, or the change in energy from one source to another
W is Work, where + work is work done on a gas, and -work is work done by the gas


Basically this is how it goes. You want delta u to equal zero. Therfore, either the gas must do work, which means expelling the energy (-W) that it gets from moving, or heat must flow out of the gas (-Q) equal to the amount of energy being exterted ON the gas, such that the equation is balanced.

You know I thought that was going to make more sense, but I think I was wrong.

 

[Bill3000]

Absolute zero is the coldest it can possibly get, is there an "absolute hottest" temperature? If yes, what is it and why (in laymans terms). If no, why not?

Yup. The limit as T goes to zero from the negative side - there is a way to define temperature as negative. It comes from its thermodynamic definition as 1/T = dS/dE, where S is entropy, and E is energy.

 

[ybbor]

AND IS there even anywhere where absolute zero exists in the universe?

without even going into background radiation, think of it this way: if heat is the movement of particles, everything had to get to where it is somehow. Unless an object was somehow at the center of the big bang and the universe and didn't get bombarded by another object, it got to where it is from somewhere, and is hence moving, and is hence at absolute zero.

this of course, assuming no influence by a creator.

 

[Comraddict]

Abosulte hotness is girl that I like.

 

[Yuri2356]

I refuse to believe that nothing can travel faster light. Diffrent colour light goes diffrent speeds.

When light travels through a medium, Photons strike atoms in the medium, their energy is absorbed by electrons, and the electrons are excited for a brief moment. The energy is then released again as light, and carry on at the same speed they did before. Light is only 'slowed' by the delay between absorbtion and emission, which is effected by the energy level of the light, which is in turn related to its frequency/wavelength/colour.

If optics were a disproof of relativity, the ToR wouldn't have made it as far as it has.

 

[Perfection]

Absolute zero is the coldest it can possibly get, is there an "absolute hottest" temperature?

Yes!
http://en.wikipedia.org/wiki/Planck_temperature

 

[Truronian]

I know that the fastest light can go is 186,000 miles per second in a vacuum and its much slower in water and other materiels.

Thats not caused by light travelling at different speeds, its light being absorbed and re-emmited by the atoms in the medium. Effectively the light is stopping and starting alot.

I have heard that c is actually the average speed of light, and a straight line its average path, though I'm not sure how much trust to put in such things (it was my secondary school physics teacher who told me).

 

[brennan]

Kinda off topic, but whats the closest people have gotten to absolute zero and is it even possible to reach absoulte zero.

AND IS there even anywhere where absolute zero exists in the universe?

Maybe interstellar space but even there i didnt think so.

The coldest temperatures reached have been in experiments with Bose-Einstein Condensates (BEC) IIRC. Look that up.

Actually reaching absolute zero may be impossible. Practically and theoretically.

 

[brennan]

Thats not caused by light travelling at different speeds, its light being absorbed and re-emmited by the atoms in the medium. Effectively the light is stopping and starting alot.

I have heard that c is actually the average speed of light, and a straight line its average path, though I'm not sure how much trust to put in such things (it was my secondary school physics teacher who told me).

c is the speed of light in a vacuum. It is a maximum. Light slows down when it passes through any other medium, the difference in velocity is proportional to the wavelength (colour) of the light. It is this change in velocity that produces refraction in transparent materials; and the difference in velocities between the different colours that spreads white light into it's component parts - producing a spectrum from a prism or a rainbow in in the atmosphere.

Chrenkov radiation is emitted when something passes through a medium faster than light can propagate through it (but still less than c).

 

[Perfection]

Actually reaching absolute zero may be impossible. Practically and theoretically.

It's impossible via Heisenberg's uncertiancy principle (and probobly other laws too). Which (as you probably arleady know) states that the uncertainty in momentum times the uncertainty in position must be greater then or equal to a certain constant (reduced Plancl's constant devided by two). For any particle as temperature goes to zero the momentum goes to zero. As this goes to zero the uncertainty of momentum goes to zero and hence the uncertainty in position must increase without bound and at some point your particles will be outside of the experimental apparatus.