How do cold packs work? Explore endothermic reactions by comparing the temperature change that results from various chemicals added to water to find out!
5 Ways to Make Homemade Ice Packs - The Make Your Own Zone
Is hot or cold better for sore muscles? - CNET
Hot pack or cold pack: which one to reach for when you're injured or in pain
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Hot and Cold Packs: A Thermochemistry Activity
How Do Instant Ice Packs Work?
Endothermic Reaction
How do cold packs create a chemical reaction that produces cold? - Quora
What happens inside an ice pack? The chemistry of cooling an ice pack
How to Make a Homemade Ice Pack: 6 Simple Ways