How do hand warmers get hot?

#032

This week, Melissa and Jam investigate reusable hand warmers. How do they get hot? Where does the heat even come from? How do reusable ones even work? Is it real? How can heat just come out of nowhere like that?

References from this episode

1. Chemistry, Edition 2 - Flowers, Theopold, Langley, Robinson
2. Chemistry, Edition 1 - Julia Burdge
3. Heat Up to Some Cool Reactions - American Chemical Society

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