How do cold packs work?
Instant hot and cold packs are used by athletes to quickly and conveniently treat an injury. They last for about 20 minutes. The packs take advantage of chemicals that either absorb a lot of heat or release a lot of heat when dissolved in water. When a chemical process absorbs a lot of heat it is called endothermic. When heat is released, it is called exothermic.
In cold packs, ammonium nitrate is used because it absorbs a lot of heat when it dissolves in water. The water and ammonium nitrate are in separate compartments in the pack. When the cold pack is needed, the chambers are broken and the ammonium nitrate dissolves in the water, absorbing heat and making the pack as cold as 0C.
In hot packs, calcium chloride or magnesium sulphate are used, along with the water. They release heat when the chambers are broken and the chemical dissolves in the water. A hot pack can reach a temperature of 90C.
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Is there chemical reactions in hot and cold packs?
Yes, hot packs have exothermic reactions (the contents create heat) and cold packs have endothermic reactions (they require heat to occur, therefore making the surroundings colder). In hot packs its a reaction between water and a salt solution, and in cold packs its normally water and ammonium nitrate. peeace
What are cold packs?
Cold packs are a category of therapeutic applications that are used deliver a comfortable and prolonged exposure to cold to a specific and isolated area of the body when in pain or injured. When a cold pack is used this way it is helpful in reducing pain and reducing inflammation. Cold packs are normally made with ice inside a closed container, or the newer form of a gel material that can be reused by placing…
Can you use ammonium nitrate as garden fertilizer i have it in the form of used chemical cold packs?
How do heat packs work?
Heat is given off as a result of a chemical reaction. Hot/cold packs are used by athletes to minimize swelling of injuries such as muscle and joint sprains. They are constructed of a large pouch containing a dry chemical plus an inner pouch of water. The hot/cold pack is activated by breaking the seal on the pouch of water and shaking the pack vigorously. This action mixes the water with the chemical starting the exothermic…
Why can't the cold pack be used more than once?
I assume you mean the chemical cold packs that you twist and shake which become cold immediately. Those cannot be reused since breaking the liquid vial and shaking mixes two chemical ingredients and result in an irreversible chemical reaction. The chemical cold packs uses the endothermic reaction of ammonium nitrate and water to cool down quickly. When one breaks a tube inside the pack the ammonium nitrate is released allowing it to mix with the…
Why don't my resource packs work in minecraft 1.6.4?
Are you sure they are compatible with Minecraft 1.6.4? You'll find that resource packs will only work with the update they are made for, so a 1.3.2 resource pack won't work with a 1.6.4 pack, for example. Another solution would be to see if you are running Optifine or MCPatcher, these allow minecraft to properly run HD resource packs