A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » SpaceBanter.com forum » Astronomy and Astrophysics » Astronomy Misc
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners


Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old January 21st 16, 01:32 AM posted to sci.astro
Pentcho Valev
external usenet poster
Posts: 8,078

Daniel P. Sheehan, Beyond the Second Law of Thermodynamics: "These culminated in 2012-13 with a series of lab- oratory experiments that showed true second law breakdown.4 The demonstration was straightforward. A small, closed, high- temperature cavity contained two metal catalysts (rhenium and tungsten), which were known to dissociate molecular hydro- gen (H2) to different degrees (Figure 1). (Rhenium dissociates hydrogen molecules into atoms better than tungsten does; conversely, tungsten recombines hydrogen atoms back into hydrogen molecules better than rhenium.) Because the disso- ciation reaction (H2 - 2H) is endothermic (absorbs heat), and the recombination reaction (2H - H2) is exothermic (liberates heat), when hydrogen was introduced into the cavity, the rhenium surfaces cooled (up to more than 125 K) relative to the tungsten (Figure 2). Because the hydrogen-metal reactions were ongoing in the sealed cavity, the rhenium stayed cooler than the tungsten indefinitely. This permanent temperature difference--this steady-state nonequilibrium--is expressly for- bidden by the second law, not just because the system won't settle down to a single-temperature equilibrium, but because this steady-state temperature difference can, in principle, be used to drive a heat engine (or produce electricity) solely by converting heat back into work, which is a violation of one of the most fundamental statements of the second law (Kelvin- Planck formulation)."

Pentcho Valev

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
GETTING RID OF THE SECOND LAW OF THERMODYNAMICS Pentcho Valev Astronomy Misc 2 June 22nd 13 10:25 AM
THE SECOND LAW OF THERMODYNAMICS IN JEOPARDY Tonico Astronomy Misc 0 March 20th 12 06:55 PM
TRAGICOMICAL THERMODYNAMICS Tonico Astronomy Misc 0 March 12th 12 01:04 PM
VERSIONS OF THE SECOND LAW OF THERMODYNAMICS Pentcho Valev Astronomy Misc 7 November 10th 11 11:29 PM
THE SECOND LAW OF THERMODYNAMICS Pentcho Valev Astronomy Misc 2 December 24th 10 01:47 AM

All times are GMT +1. The time now is 08:48 AM.

Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2004-2022 SpaceBanter.com.
The comments are property of their posters.