| Author |
 Topic  |
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Baikonur
Radio Wave
Finland
34 Posts |
 Posted - 02/26/2003 : 06:56:46
If time is, as it has been said, increasing entropy, wouldn't 0 K stop time, 'couse the particles wouldn't be moving (right?) and therefore not increasing entropy?I just don't get it...
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loop quantum gravity
Infrared Wave
Israel
389 Posts |
Posted - 02/26/2003 : 13:17:02
but practically you can't get to 0 kelvin (you can get an approximation).
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nowonmai
Radio Wave
Ireland
26 Posts |
Posted - 03/05/2003 : 12:53:58
0 kelvin is just an interpolation from observed effects of decreasing temperature.. it can't actually be achieved
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Phobos
PF Mentor
USA
1417 Posts |
Posted - 03/07/2003 : 17:53:25
the cosmic background radiation temperature is at about 2.3 K....good luck escaping that heat source (or sink, for those of us on the cozier side of that scale)--------------------------
In the fabric of space and in the nature of matter, as in a great work of art, there is, written small, the artist’s signature. (from Sagan's "Contact")
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Phobos
PF Mentor
USA
1417 Posts |
Posted - 03/07/2003 : 17:56:46
oh, and the second law of thermodynamics (entropy) does not state that entropy must always increase....it says that for an isolated (closed) system, entropy must increase or stay the same (i.e., it can't decrease)So, zero change in entropy for a given situation is ok. --------------------------
In the fabric of space and in the nature of matter, as in a great work of art, there is, written small, the artist’s signature. (from Sagan's "Contact")
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cragwolf
Micro Wave
Australia
133 Posts |
Posted - 03/08/2003 : 05:44:05
quote:
Originally posted by Phobos:
the cosmic background radiation temperature is at about 2.3 K....good luck escaping that heat source (or sink, for those of us on the cozier side of that scale)
In some types of proto-planetary nebulae you can escape that heat source, and find temperatures as low as 1K (possibly even lower like 0.5K) occurring.
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