Previous by Date: Subject: Re: [DCHAS-L] 4% vs. 5% hydrogen Date: Tuesday, June 5, 2018 at 9:30:30 PM Author: Jeff Tenney <jtenney46**At_Symbol_Here**ATT.NET>
From: Whitney Rochelle Hess <wrhess**At_Symbol_Here**MIT.EDU>
Subject: Re: [DCHAS-L] 4% vs. 5% hydrogen
Date: Wed, 6 Jun 2018 01:38:27 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 1E916DD1F7B7064CA3FCF8DF6F9BA213015F7000A9**At_Symbol_Here**OC11EXPO30.exchange.mit.edu
In-Reply-To
Demystify:
Hi Debbie,
This is related to the molar heat capacity of the inert gas. The larger the molar heat capacity, the greater the inerting effect. Argon has a smaller molar heat capacity compared to nitrogen, so a lower concentration of H2 in argon would support flame
propagation. ISO 10156 is a good reference for this.
From: ACS Division of Chemical Health and Safety [DCHAS-L**At_Symbol_Here**PRINCETON.EDU] on behalf of Debbie M. Decker [dmdecker**At_Symbol_Here**UCDAVIS.EDU] Sent: Tuesday, June 05, 2018 7:34 PM To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU Subject: [DCHAS-L] 4% vs. 5% hydrogen
Hi all:
Riddle me this - why is 5% hydrogen in nitrogen considered NOT flammable and 4% in argon considered flammable? Tried to reach Praxair but no one is home.
This makes absolutely no sense to me.
Thanks,
Debbie
Debbie M. Decker, CCHO, ACS Fellow
Past Chair, Division of Chemical Health and Safety
can proceed violently in the presence of an idiot."
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