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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