From:
Steve McLean <steve_mclean**At_Symbol_Here**BYU.EDU>
Subject:
Re: [DCHAS-L] Liquid Nitrogen Ice Cream
Date:
Sep 23, 2016 02:19 UTC
Reply-To:
ACS Division of Chemical Health and Safety
In-Reply-To:
There are better, and safer, ways to teach heat transfer. I cannot, in good conscience, recommend putting your hand into a fire or into liquid nitrogen for "demonstration" purposes. Doing so invites the potential for injury and I have seen impressionable
youth try to imitate such actions without the proper understanding of the principles involved.
I believe the ACS has also formally discouraged this type of activity in chemistry outreach programs.
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: davivid <davivid**At_Symbol_Here**WELL.COM>
Date: 9/22/16 7:43 PM (GMT-07:00)
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Liquid Nitrogen Ice Cream
One thing I've done with lN2 demos (older children in company of
parents) is to point out that while liquid nitrogen can burn you, just
as you can run your hand through a flame quickly and not get burned
(watch out for flammable clothing, etc) you can also contact small
amounts of liquid nitrogen (or dry ice) without harm if done quickly.
This leads into lessons on heat transfer and awareness of items that can
trap liquids against the skin. While it is important to teach awareness
of hazards, it is also important to do so in a way that does not lead to
the "chemicals are inherently bad" mind set.
Dave
On 22/9/16 5:29 PM, Frank Stewart wrote:
> If you are working with large amounts of liquid nitrogen in a confined space, make certain that there is good ventilation so the oxygen levels are maintained at a safe level.
>
> Frank
>
> Sent from my iPad
>
>> On 23 Sep, 2016, at 6:30 am, Melissa Anderson <mwanderson08**At_Symbol_Here**GMAIL.COM> wrote:
>>
>> I have a colleague who's interested in making liquid nitrogen ice cream as an outreach activity and he asked me about safety/risk implications. Does anyone have any experience with this from a risk assessment perspective?
>>
>> Thanks!
>> Melissa Anderson
>> Chemistry Instructor
>> Pasadena City College
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> This e-mail is from DCHAS-L, the e-mail list of the ACS Division of Chemical Health and Safety.
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