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Anne Marie Helmenstine, Ph.D.

Ammonium Nitrate Cold Pack

By May 4, 2010

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One easy way to make your own cold pack, which is a nice example of an endothermic reaction, is simply to dissolve ammonium nitrate in water. This chemical reaction gets quite cold, so be careful (i.e., don't hold the reaction in an uninsulated container in your hand). If you don't have ammonium nitrate, there are several other chemicals you can mix to make a cold pack.


May 4, 2010 at 5:31 pm
(1) Ken says:

I do apologize u I don’t come to comment this topic but I really wanna know if one radioactive has shorter half-life than another one, will it be more harmful ?
Sorry again for stirring up this topic, but it’s cool to know how to make cool pack.
Really thanks.
I’m looking forward to hearing ur answer.
Best Regard…..

May 4, 2010 at 11:18 pm
(2) pradeep says:

Dear Madam, Im a M.Sc student of university of colombo(SRi Lnaka).I found your bolg when i was searchin for CO detection sensor. Im interesting to develop a gas sensor to detect NOx, SOx or CO like pollutant gasses. Still we were unable to find a proper method to develop a sensor. If u can help that would be a great for me madam. Thank you.

May 5, 2010 at 1:35 am
(3) Kirby says:

To Ken: your question about half lives of radioactive isotopes and the danger. It depends on what type of radioation that is being emitted.

April 14, 2012 at 10:11 am
(4) TPerry says:

Please help!! I’m trying to come up with a short list of environmentally safe endothermic reactions that can drop temperatures to between 0-15 degrees C. Any suggestions would be greatly appreciated.

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