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-   -   Absolute zero.. not so absolute? (http://hfboards.hockeysfuture.com/showthread.php?t=1315901)

f1nn 01-04-2013 02:05 PM

Absolute zero.. not so absolute?
 
http://www.nature.com/news/quantum-g...e-zero-1.12146

Thought this was kind of cool

Sevanston 01-04-2013 07:29 PM

Quantum physics continues its giant piss on common sense.

njdevsfn95 01-04-2013 09:50 PM

Its not below absolute zero because the particles have energy.

It took me 3 different articles to grasp that fact but i dont think I can explain why its a "negative" temperature yet not below absolute zero.

Krishna 01-04-2013 10:58 PM

Quote:

Originally Posted by njdevsfn95 (Post 57116909)
Its not below absolute zero because the particles have energy.

It took me 3 different articles to grasp that fact but i dont think I can explain why its a "negative" temperature yet not below absolute zero.

Here's a little scale to use

+0 K, ... , +300 K, ... , +∞ K, −∞ K, ... , −300 K, ... , −0 K

njdevsfn95 01-05-2013 12:53 AM

The explanation reminded me of Dr. Nick Riviera exclaiming, "Inflammable means flammable?"

So +Infinity Kelvin = -Kelvin.

What a country!

Unaffiliated 01-05-2013 04:42 AM

edit: sorry, this one is actually a decent article. thought this was a different article, which was totally sensatonalist


Has to do with a very technical definition of temperature concerning energy input and entropy, not the more "classical" internal kinetic energy.



If you bring a negative temperature object into thermal contact with any normal object, heat will flow FROM the negative TO the positive. In that sense, you could think of it as hotter than anything.


This is quantum behaviour, though, acting only in tiny tiny spaces for tiny amounts of time.

Unaffiliated 01-05-2013 04:48 AM

http://en.m.wikipedia.org/wiki/Population_inversion

http://en.m.wikipedia.org/wiki/Negative_temperature

MarkGio 12-19-2013 03:05 PM

I've never seen this thread before. This is amazing. I'm not sure how this works however...

Earth receives energy from the sun. So if you're a planet in the middle of nowhere receiving no energy, how could your temperature be less than absolute zero?

PredsV82 12-19-2013 07:50 PM

Quote:

Originally Posted by MarkGio (Post 76455473)
I've never seen this thread before. This is amazing. I'm not sure how this works however...

Earth receives energy from the sun. So if you're a planet in the middle of nowhere receiving no energy, how could your temperature be less than absolute zero?

doesn't work on a planetary scale, only at the quantum level, where the speed of light can be broken and a cat can be both dead and alive at the same time


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