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Frey Scientific Reusable Heat Pack, 8 x 8 Inches
Item #: 1392321
Show students an example of a chemical reaction that they can hold in their hand and feel with this reusable heat pack!
$20.89
$15.67
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Description
Specifications
Customer Reviews
The hand warmer contains a super saturated solution of water and sodium acetate. Snapping the metal disc creates a chain reaction causing the solution to crystallize, giving off heat. The heat packs can be recharged back to the liquid state by boiling water for 10-15 minutes and allowed to slowly cool. 8 x 8 inches.
- Shows how sodium acetate uses the process of supercooling to create heat
- Great for everything from muscle aches to scientific demonstrations
- Combines practical applications with a process that's fun to watch
- Reusable and compact - perfect for classrooms
Includes:
- 1 Heat Pack
