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Absolute zero.. not so absolute?

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01-04-2013, 02:05 PM
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f1nn
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Absolute zero.. not so absolute?

http://www.nature.com/news/quantum-g...e-zero-1.12146

Thought this was kind of cool

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01-04-2013, 07:29 PM
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Sevanston
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Quantum physics continues its giant piss on common sense.

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01-04-2013, 09:50 PM
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njdevsfn95
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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.

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01-04-2013, 10:58 PM
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Krishna
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Quote:
Originally Posted by njdevsfn95 View Post
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

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01-05-2013, 12:53 AM
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njdevsfn95
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The explanation reminded me of Dr. Nick Riviera exclaiming, "Inflammable means flammable?"

So +Infinity Kelvin = -Kelvin.

What a country!

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01-05-2013, 04:42 AM
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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.

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01-05-2013, 04:48 AM
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http://en.m.wikipedia.org/wiki/Population_inversion

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

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12-19-2013, 03:05 PM
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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?

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12-19-2013, 07:50 PM
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Quote:
Originally Posted by MarkGio View Post
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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