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Author Topic: Colder than Absolute Zero  (Read 711 times)

RandallS

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Colder than Absolute Zero
« on: January 04, 2013, 11:12:02 am »
Due to a quirk of quantum physics, it seems the temperature of a gas can drop below absolute zero.

Read the article
Randall
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woodhick

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Re: Colder than Absolute Zero
« Reply #1 on: January 04, 2013, 05:23:35 pm »
Quote from: RandallS;89033
Due to a quirk of quantum physics, it seems the temperature of a gas can drop below absolute zero.

Read the article

 
interesting, I remember hearing about this a few years ago as a blurb, but nothing more. Granted that I am a biologist and not a physicist, so it wouldn't be popular in the normal stuff i read.
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Re: Colder than Absolute Zero
« Reply #2 on: January 04, 2013, 06:11:01 pm »
Quote from: RandallS;89033
Due to a quirk of quantum physics, it seems the temperature of a gas can drop below absolute zero.

Read the article

 
Never say never, right?  Amazing.
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Re: Colder than Absolute Zero
« Reply #3 on: January 04, 2013, 06:14:31 pm »
Quote from: RandallS;89033
Due to a quirk of quantum physics, it seems the temperature of a gas can drop below absolute zero.

Read the article
The universe continues to amaze us.
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RandallS

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Re: Colder than Absolute Zero
« Reply #4 on: January 04, 2013, 09:12:54 pm »
Quote from: woodhick;89075
interesting, I remember hearing about this a few years ago as a blurb, but nothing more.

After doing a bit more reading on my part, it doesn't look like this is the first time a negative absolute temperature has been achieved, but rather the first time it has been done in a relatively "large" group of atoms.
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Dragonoake

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Re: Colder than Absolute Zero
« Reply #5 on: January 07, 2013, 02:08:40 am »
Quote from: Cryfder;89080
The universe continues to amaze us.


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Dragonoake

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Re: Colder than Absolute Zero
« Reply #6 on: January 07, 2013, 02:39:34 am »
Quote from: RandallS;89033
Due to a quirk of quantum physics, it seems the temperature of a gas can drop below absolute zero.


It appears to have more to do with entropy and kinetic energy that with actual temperature
 
http://www.sciencedaily.com/releases/2013/01/130104143516.htm

RandallS

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Re: Colder than Absolute Zero
« Reply #7 on: January 07, 2013, 08:16:27 am »
Quote from: Dragonoake;89501
It appears to have more to do with entropy and kinetic energy that with actual temperature

True -- it seems to depend on how you define temperature and how you define absolute zero.
Randall
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