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From: werner@aecom.UUCP (Craig Werner)
Newsgroups: net.physics
Subject: Re: Re: Auto exhaust 1 gal gas ---) 1 1/2 gal water
Message-ID: <1090@aecom.UUCP>
Date: Tue, 8-Jan-85 00:29:26 EST
Article-I.D.: aecom.1090
Posted: Tue Jan  8 00:29:26 1985
Date-Received: Fri, 11-Jan-85 05:09:55 EST
References: <174@dmcnh.UUCP> <421@cepu.UUCP>
Distribution: net
Organization: Albert Einstein Coll. of Med., NY
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> Stephen C. Woods (VA Wadsworth Med Ctr./UCLA Dept. of Neurology) writes:

>   As an interesting side light, burning 1 Gal of gasoline (Petrol for our
> English friends) produces about 1.5 Gal of water (I misremember the exact
> amount but I know that it was more than the volume of fuel).  Airships

	Well, let's do the calculation: let assume gasoline that is all
octane: that's C8H18. 18 hydrogens gives 9 molecules of water for each of
gasoline. Actually, gasoline is less than that, it tends to be a lot of 
heptane and some nonane, etc... So give it 8.5 (8 would be pure heptane).
	However, car engines are about 1/4 efficient, so make it a little
above 2 waters/gasoline.
	Then remember, water is denser than gasoline. The specific gravity
of gasoline is about .8.  And 2*.8 = 1.6 but this is all estimates.

	So, yeah, about 1 1/2 is a good ballpark guess. I'll give it to you.
	It might be more in new fuel efficient models.
[Remember,these numbers are for comparison only. Your gallonage may vary.]:-)


-- 
				Craig Werner
				!philabs!aecom!werner
		What do you expect?  Watermelons are out of season!