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From: neufeld@physics.utoronto.ca (Christopher Neufeld)
Newsgroups: sci.astro,sci.space,sci.space.shuttle
Subject: Re: Shuttle scrubbed again
Message-ID: <1990Sep25.090336.28846@helios.physics.utoronto.ca>
Date: 25 Sep 90 13:03:36 GMT
References: <1990Sep17.224055.1343@murdoch.acc.Virginia.EDU> <993@dg.dg.com>
Organization: University of Toronto Physics/Astronomy/CITA
Lines: 27

In article <993@dg.dg.com> ahughes@dg-rtp.dg.com (Arch Hughes) writes:
>gsh7w@astsun.astro.Virginia.EDU (Greg S. Hennessy) writes:
>|> 
>|> A hydrogen
>|> leak caused a concentration of more than 1000 ppm in the aft
>|> compartments. Values of 2275 ppm were measured.
>|> 
>|> -Greg Hennessy, University of Virginia
>|>  Internet:      gsh7w@virginia.edu  
>|>  UUCP:		...!uunet!virginia!gsh7w
>
>
>Anyone know what concentrations of hydrogen are capable of causing a 
>real explosion?          

   According to the 1989-1990 CRC handbook, hydrogen in air will burn
with flame propagation for a hydrogen concentration between 4.00% and
74.20% by volume. So, 2275 ppm is roughly a nineteenth of the minimum
concentration required to cause an explosion, assuming that measure is
ppm volume.


-- 
 Christopher Neufeld....Just a graduate student  | "The pizza was just a
 neufeld@helios.physics.utoronto.ca    Ad astra! | detonator; I mean, if
 cneufeld@{pnet91,pro-micol}.cts.com             | it had set off the 
 "Don't edit reality for the sake of simplicity" | hams...." Downtown Brown