76K views · 824 reactions | How do instant cold packs work? 類略 Instant cold packs work by using an endothermic reaction: you squeeze the pack to break an inner bag of water, which mixes with a solid compound like urea or ammonium nitrate. This mixing process absorbs heat from its surroundings, including the air and anything the pack touches, making it feel cold! #science #physics #technology #knowledge #howitsmade | Learning with Lyrics | Facebook
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76K views · 824 reactions | How do instant cold packs work? 類略 Inst…
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流 What’s Inside an Instant Cold Pack? No fridge? No problem! Just squeeze, shake, and feel the chill ❄️ Perfect for sports bags, first aid kits, or anywhere on-the-go. ✅ No refrigeration needed ✅ Activates in seconds ✅ Compact + convenient #FirstAidEssentials #ColdPack #InjuryReady #FirstAidDistributions #OnTheGoRelief #SportsInjury #BePrepared | First Aid Distributions | Facebook
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