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Author Topic:   Thermodynamics and The Universe
happy_atheist
Member (Idle past 4935 days)
Posts: 326
Joined: 08-21-2004


Message 3 of 186 (383002)
02-06-2007 4:02 PM
Reply to: Message 1 by cavediver
02-06-2007 2:28 PM


cavediver writes:
Thermodynamics applies to systems of multitudes of classical particles.
This was one of the most amazing things I saw when I was studying physics. I hated thermodynamics, but when I took a statistical mechanics course and saw the well known 'laws' drop out from simple quantumn mechanics (ha!) and some approximations that can only be made with extremely large numbers of particles it was quite eye opening. I only wish I'd been better at physics overall so I could have made a go of it. Seeing this thread again has made me want to go find my physics texts and start learning all over again!
But it does bring to light how hard it is for a non-physicist to grasp how their every-day point-of-view governed by common sense rules is totally non-applicable to the universe as a whole. I certainly look forward to EODoc's response (or anyone else who decides to take the challenge).

This message is a reply to:
 Message 1 by cavediver, posted 02-06-2007 2:28 PM cavediver has replied

Replies to this message:
 Message 6 by cavediver, posted 02-07-2007 1:23 PM happy_atheist has not replied

  
happy_atheist
Member (Idle past 4935 days)
Posts: 326
Joined: 08-21-2004


Message 20 of 186 (383432)
02-08-2007 5:20 AM
Reply to: Message 19 by cavediver
02-08-2007 4:44 AM


cavediver writes:
The positive energy of the mass is offset by the negative energy of the expansion.
I assume that this is an approximation that applies only to macroscopic systems? If so, does this approximation break down as one approches a singularity? Is 'Energy' of any use at that point?

This message is a reply to:
 Message 19 by cavediver, posted 02-08-2007 4:44 AM cavediver has replied

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 Message 22 by cavediver, posted 02-08-2007 5:55 AM happy_atheist has not replied

  
happy_atheist
Member (Idle past 4935 days)
Posts: 326
Joined: 08-21-2004


Message 21 of 186 (383433)
02-08-2007 5:37 AM
Reply to: Message 13 by Buzsaw
02-07-2007 6:55 PM


Buzsaw writes:
1. The above statement as well as if the universe is a closed and finite system makes my point in another thread that there indeed was no before the universe and no outside of the universe if it is a closed, bordered and finite system. Thus our resident Biblical theists do indeed have the problem that I raised in my thread that the Biblical god in whom they believe could not possibly exist on the basis of such a universe.
2. I don't see how you can exempt laws of physics from the science of a system origin hypothesis which itself defies the the laws observed within the system. Isn't that what you are forbidding ID creatonists to do? Essentially you are assuming that the entire energy of the universe popped into existence suddenly from nothing. The only other alternative is that the Universe is infinite without beginning or end as we claim for the intelligent designer, the source of all existing energy.
Is it me or are those two statements self-contradictory? In the first statment you talk about there being no such thing as 'before' the universe. In the second statement you say
Essentially you are assuming that the entire energy of the universe popped into existence suddenly from nothing.
Now the wording of this strongly implies that there was a point in time 'before' the universe when there was nothing, and then some time later the universe existed. The two statements are fundamentally incompatible.
Buzsaw writes:
I don't see how you can exempt laws of physics from the science of a system origin hypothesis which itself defies the the laws observed within the system.
I'm assuming you're talking about Thermodymics being unapplicable with the 'creation' of the universe here (since this would be on topic)? As has been mentioned there are very good reasons why Thermodynamics is unapplicable to t=0, it isn't just claimed for convenience. Thermodynamics is an emergent property from a large system including staggering numbers of particles. A gas consisting of 10 atoms would not display the same properties as a gas consisting of a molar quantity. From my understanding of current theories there were no atoms (or particles of any kind) in existence anywhere near to t=0 (speaking in relative terms), so what exactly would Thermodynamics be acting upon?
Buzsaw writes:
The only other alternative is that the Universe is infinite without beginning or end
Not really on topic, but why does a universe 'with no beginning or end' have to be infinite?

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 Message 13 by Buzsaw, posted 02-07-2007 6:55 PM Buzsaw has replied

Replies to this message:
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