GAS JEANS : Actually, I am right, though my phrasing may have been misleading.So are you. It depends, of course, on what you mean by ``the overall entropy of the universe,'' and where you make the split between the``system'' and the ``universe.''Start with a uniform gas in an otherwise empty region. If the gas isbig enough or dense enough---if its volume is larger than roughlythe cube of the Jeans length---it will begin to collapse into lumps.This dynamical instability has been known since Jeans' work in 1902.These days it can be watched quite carefully in many-body computersimulations.What happens to entropy during this process? The modern work onthis apparently began with a 1962 paper by Antonov, but it's in an obscure Russian journal, and I confess I haven't read it. The usualreference is a paper by Lynden-Bell and Wood, Mon. Not. R. Astr. Soc.138 (1968) 495. As you say, the entropy of each individual clumpdecreases. As I say, the entropy of the system as a whole increases.This is not a contradiction. It possible because during the process of gravitational collapse, individual particles and small clumps get flung out of the collapsing regions at very high speeds. The ``extra'' entropy ends up in a hot, thin ``interstellar'' gas.
GAS JEANS : You can, if you like, call this an increase in the entropy of the ``restof the Universe.'' But the ``rest of the Universe'' here need not besome separate system; it can be a portion of the gas you started out with. In particular, you don't need to have something else to carry off the energy, although the clumping will happen faster if you do.In fact, you can imagine putting the whole system inside a perfectly reflecting box, so the ``interstellar gas'' can't escape. If the box is bigenough, you will still get a ``gravothermal catastrophe''---the gaswill segregate into a contracting central core and a surrounding halo.So I stand by my statement that an ``inert uniform'' state has lowentropy compared to a lumpy, uneven state, provided that it's theright lumpy, uneven state---the one produced by the dynamicalevolution. The key point is that the ``inert uniform'' state has alow entropy, and that dynamical processes increase that entropywhile making the state much clumpier.
GAS JEANS : "Michael L. Arends" wrote in message...Previous poster is correct, the liquid gas doesn't burn. It is the fumescoming off the liquid gas, at the edge between liquid and air, that burn. Doa web search on 'vapor pressure' and what mix ranges various hydrocarbonsburn at. Gasoline, IIRC, is about 17% to 86%, which is what makes it sohandy as fuel. A quarter-full gas tank is much more dangerous in a wreckthan a full tank. Sounds like your friend did more than splash a little gason his jeans, and/or had a little napalm (gas+styro) stuck to him. In eithercase, it was the fumes being outgassed that lit up.A trivial distinction, mayhaps, since the flaming fumes burn you just asbad. Don't believe me, go back and visit your high school chem teacher, orthe nearest firehouse. We used to use gas for parts washing, before itbecame politically incorrect. If you let the bucket sit uncovered for anhour or so, all the volatiles evaporated off, and it didn't cut grease wortha darn anymore. That is why your mower is so hard to start in spring, if youare using last fall's gas. The VOCs migrate away, right through the plasticcan, or the non-airtight-lid.
GAS JEANS : I was lucky enough to see a few of the GAS ladies at the First Union Pro race &thought they were all hot! Any info on their roster?Their roster for the Liberty Classic race was:Valeria Cappellotto (Italian National Champion), Luisana Pegoraro, Greta Zocca,Roberta Buonanomi, Simone Parente, all Italians and Pia Sundstadt from Finland.Sorry but I have to correct you.Parente's name is SimonA. It is relevant because Simone in italian is amale name.BTW - There are a couple other minor errors. It's LuisIana Pegoraro andRoberta Bonanomi (without a "u"). While I ain't finnish, I also think thatPia's second name is SundstEdt.This was just for the sake of correctness.Of course you can always correct me for my poor english.No problem, Davide. Thanks for the corrections. I was just copying what was listedon First Union's official roster. Seems like someone there could have used yourproofreading skills back in June!
GAS JEANS : - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*Using >> Falcon030 (14meg w/Nemesis), NVDI 4.1, MagiC 5.11, STinG 1.20- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -This only seems to happen the FIRST time I run CAB 2.7 after booting the computer (ie. the computer has been turned OFF for several hours prior to booting it):Ok, I boot the Falcon, connect to my ISP with STinG, load CAB, then no matter what page I try to access, CAB will freeze up during the first 10-20 seconds of loading the page (and this happens regardless of whether I delete CAB's cache first). And unfortunately, it COMPLETELY freezes up the Falcon, I can't even access the Program Manager to terminate CAB manually, nor shutdown. I have to reboot with a reset.And after this, if I reload CAB and try again, I never have a problem. It works fine the whole session.And in case anyone is wondering, it doesn't seem to matter how long the Falcon has been turned on. I could have had it on for 5 minutes or 4 hours, but if this is the first time I run CAB and try to load a page in that particular session, it will freeze up.
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