Science Fun

Homemade Hand Warmer

In this easy science experiment for kids you will learn to make a super easy homemade hand warmer using calcium chloride and SAP crystals. This is a great activity to demonstrate an exothermic chemical reaction and the result is an awesome hand warmer that works really well and produces an impressive amount of heat.

 

Materials:

  • Small ziplock baggie
  • About one tablespoon of SAP crystals or water beads
  • About one tablespoon of calcium chloride
  • Water

 

Instructions:

  1. Open the ziplock baggie and put the SAP crystals inside.
  2. Add about a quarter cup of water. 
  3. Zip the baggie closed and let it sit for several minutes until the water is mostly absorbed. 
  4. Now add the calcium chloride to the baggie.
  5. Add about another quarter cup of water and zip the baggie closed securely. Try not to leave a lot of extra air in the baggie. 
  6. Knead the baggie until the calcium chloride is dissolved.
  7. You will feel a significant increase in temperature. 

 

WATCH THE QUICK AND EASY VIDEO TUTORIAL

 

How it Works:

When the solid calcium chloride dissolves in water, an exothermic chemical reaction occurs releasing heat. 

 

Make This A Science Project:

What happens if you use a larger baggie? What happens if you use a different amount of water? What happens if you use a different liquid? What happens if you add an entirely new ingredient like iron filings to the experiment? 

 

EXPLORE TONS OF FUN AND EASY SCIENCE EXPERIMENTS!

 

 

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