Date: Tue, 29 Sep 2009 01:17:47 -0400
Reply-To: Christopher Suznovich <snuz**At_Symbol_Here**MAC.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Christopher Suznovich <snuz**At_Symbol_Here**MAC.COM>
Subject: Re: Pressure-Generating Liquid
In-Reply-To: <792484.46218.qm**At_Symbol_Here**>

Any state of matter of at absolute zero will generate pressure since its
molecules are in motion.  For example, the ocean exerts pressure upwards
onto the sky and the air in the sky is exerting pressure onto the surface o
the water.

Low boiling/flash point liquids, especially alcohols and flammables are goo
examples.  If you have ever seen a wash bottle over-filled with methanol,
IPA, or acetone in the lab when the lab temp is 23oC or higher?  You can
often see, the over-filled wash bottles dripping as the liquid inside
evaporates and the vapor pushes down onto the liquid, the liquid pushes bac
with greater force while it is also expanding and leaks out of the bottle.

Chris Suznovich

> From: Todd 
> Reply-To: Todd 
> Date: Mon, 28 Sep 2009 12:41:04 -0700
> To: 
> Subject: Re: [DCHAS-L] Pressure-Generating Liquid
> This is a good point,
> Materials which can decompose, outgas, or volatilize will often have pres
> relief caps if they are not flammable - most Bulk manufacturers install t
> in the drums and IBCs used for transport, per DOT guidelines. However som
e of
> the repackagers fail to do this, I've observed.
> Two examples that come to mind are Hydrogen Peroxide and Bleach.
> Todd
> Todd Perkins
> Airgas Mid AMerica
> p3wt3r**At_Symbol_Here**
> --- On Mon, 9/28/09, List Moderator  wrote:
>> From: List Moderator 
>> Subject: Re: [DCHAS-L] Pressure-Generating Liquid
>> To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
>> Date: Monday, September 28, 2009, 2:23 PM
>> From:=A0"Kohler,
>> Chris E" 
>> Date:=A0September
>> 28, 2009 3:19:02 PM EDT
>> Subject:=A0RE:
>> [DCHAS-L] Pressure-Generating Liquid
>> Formic acid will
>> decompose to form carbon monoxide and water and can
>> over-pressurize the container. I have heard that some
>> manufacturers are installing pressure relief caps
>> now.Chris

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