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From: gsh7w@astsun.astro.Virginia.EDU (Greg Hennessy)
Newsgroups: sci.space,sci.astro,sci.space.shuttle
Subject: Re: Shuttle scrubbed again
Message-ID: <1990Sep25.152824.15327@murdoch.acc.Virginia.EDU>
Date: 25 Sep 90 15:28:24 GMT
References: <1990Sep17.224055.1343@murdoch.acc.Virginia.EDU> <993@dg.dg.com>
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In article <993@dg.dg.com> ahughes@dg-rtp.dg.com (Arch Hughes) writes:
#Anyone know what concentrations of hydrogen are capable of causing a 
#real explosion?          

About 4 percent, or 40,000 ppm. The limit for a shuttle launch is
1,000 ppm.


--
-Greg Hennessy, University of Virginia
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