The heat pack contains a super saturated solution of water and sodium acetate. Snapping the metal disc creates a chain reaction causing the solution to supercool and crystallize. Because sodium acetate "freezes" at 130 degrees Fahrenheit, the process actually creates what we consider heat. The heat packs can be recharged back to the liquid state by boiling water for 10-15 minutes, making sure all crystals disappear, and allowed to slowly cool. 4 x 4 inches.
Features - Reusable Heat Pack
- 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!
Includes: Specifications - Size: 4" x 4"
- Grade Level: Middle-High School
- Safety: No Choking Hazard
- Allergens: Contains No Allergens
- Material: Vinly, Water
- SKU: ZX9SSPC267394
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