EVGRAY Archive

Negative absolute temperature

2 messages · 2019-07-23T21:26:03+00:00 → 2019-07-24T07:22:21-07:00

[1/2] Negative absolute temperature

2019-07-23T21:26:03+00:00 · onielsen2000 <[email protected]>
Message-ID: <[email protected]> 
A search on negative temperature shows that quantum thermodynamics actually operate with negative temperature. This is temperatures above infinite positive temperatures and thus the hottest temperatures of anything: https://wiki2.org/en/Negative_temperature https://wiki2.org/en/Negative_temperature

Negative absolute temperature can be achieved from population inversion in LASERs where more of the atoms are in higher excited states than in lower unexcited states: https://wiki2.org/En/Population_inversion https://wiki2.org/En/Population_inversion.
 
Here is a video showing what happens:
What Happens if You Focus a 5W Laser With a Giant Magnifying Glass? Negative Kelvin Temperature! (8:25): https://www.youtube.com/watch?v=jdjTYlReE-I https://www.youtube.com/watch?v=jdjTYlReE-I 

Regards
Ole

[2/2] Re: [EVGRAY] Negative absolute temperature

2019-07-24T07:22:21-07:00 · Mick <[email protected]>
Message-ID: <[email protected]> 
Ole, That's amazing info!

On 7/23/2019 2:26 PM, [email protected] [EVGRAY] wrote:
>  
>
> A search on negative temperature shows that quantum thermodynamics
> actually operate with negative temperature. This is temperatures above
> infinite positive temperatures and thus the hottest temperatures of
> anything: https://wiki2.org/en/Negative_temperature
>
> Negative absolute temperature can be achieved from population
> inversion in LASERs where more of the atoms are in higher excited
> states than in lower unexcited states:
> https://wiki2.org/En/Population_inversion.
>
>
> Here is a video showing what happens:
> What Happens if You Focus a 5W Laser With a Giant Magnifying Glass?
> Negative Kelvin Temperature!(8:25):
> https://www.youtube.com/watch?v=jdjTYlReE-I
>
> Regards
> Ole
>
>