DCHAS-L Discussion List Archive
Date: Thu, 11 Mar 2010 13:49:10 -0800
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Chuck Cooper <cooperc**At_Symbol_Here**PDX.EDU>
Subject: Re: Cryogenics face shield?
In-Reply-To: <8B2D3AEB-43F4-4AAC-BD15-0153E9D7CC28**At_Symbol_Here**uvm.edu>
Liquid nitrogen boils at -321 =B0F, normal skin temperature is around
90 =B0F, thats over 400 =B0F difference. A splash of LN2 is not
actually
going to touch the skin because of the Leidenfrost effect, a
phenomenon in which a liquid, in near contact with a mass
significantly hotter than the liquid's boiling point, produces an
insulating vapor layer. Your likely to be harmed from LN2 only if your
skin is continuously exposed. See these demonstrations:
Hand vs. Liquid Nitrogen and the Leidenfrost Effect
http://www.youtube.com/watch?v=gjsMV1MglA4
Mr Robinson Drinks Liquid Nitrogen!
http://www.youtube.com/watch?v=UHjC9G03bdE&NR=1
mrhelix drunks liquid nitrogen
http://www.youtube.com/watch?v=-FkPbi4-ZTM
Chuck Cooper
Environmental Health and Safety
Portland State University
503-725-4312
cooperc**At_Symbol_Here**pdx.edu
On Mar 11, 2010, at 9:44 AM, Ralph Stuart wrote:
> A lab tech writes:
> Do you have a recommendation for an appropriate face shield that
> people should be using when working with LN2? I've been searching
> the web and it's hard to find a specific recommendation for a face
> shield to be worn with cryogenics. I don't see any guidelines on
> OSHA that point to any particulars and nothing on the Cryogenic
> Society of America's site either. I would appreciate your assistance.
>
> Does anyone have any favorites they'd like to recommend?
>
> - Ralph
>
> Ralph Stuart, CIH
> Environmental Safety Manager
> University of Vermont
> Environmental Safety Facility
> 667 Spear St. Burlington, VT 05405
>
> rstuart**At_Symbol_Here**uvm.edu
> fax: (802)656-5407
>
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