Also consider gasses compressed into liquid form: 

Liquid Nitrogen
Liquid Oxygen
Liquified Petroleum Gas (Propane, butane, propylene, etc)
Liquid Chlorine
among many others.....

These can be deadly when the container is heated past the point where the l
iquid is converted to gass too rapidly for the pressure relief valve/device
 to compensate. Boom.

Most cylinders are designed to "banana peel", but there is always a possibi
lity of shrapnel, depending on how rapidly the cylinder is overheated.

Even in normal usage in a dewar or similar container, these liquids sublime
, creating pressure.

Todd Perkins
Airgas Mid America
p3wt3r**At_Symbol_Here**charter.net

--- On Mon, 9/28/09, Diane Amell  wrote:

> From: Diane Amell 
> Subject: [DCHAS-L] Pressure-Generating Liquid
> To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
> Date: Monday, September 28, 2009, 10:28 AM
> 
>  
>  
>  
> Last week one of our investigators threw me a curve
> ball. She had an inquiry from an employer or consultant
> regarding "pressure-generating liquids". The term
> is new to me. I have a mental picture based on the words in
> the phrase which may or may not be accurate. The only
> reference I have found so far regards the old-fashioned soda
> acid and self-generating foam water-type extinguishers in
> the federal portable fire extinguishers standard. I have
> searched the federal OSHA, NIOSH and ACS Web sites with no
> luck. Anyone familiar with such chemicals? Thank you.
> =A0
> - Diane Amell, MNOSHA 
> 

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