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The first ice pack was invented by Albert A. Robbins in 1959. His version was different than what we see today, as it was an "instant" ice pack meant for keeping food and drinks cold for short periods of time. The ice pack would stay at room temperature until the cooling effect was activated by cracking it.

How a cold pack works:

Endothermic chemical reactions can also be used to produce cold packs, such as those used in sports medicine. Chemical cold packs have similar engineering to hot packs, with reactants in a pouch that react when the barrier between them is broken by squeezing the package. A typical endothermic process used in cold packs is simply the dissolving of ammonium chloride in water. The reactants have the bond energy required to break the bonds of ammonium chloride to form ammonium and chloride ions and dissolve them in water.

The reaction mixture obtains this energy by absorbing it from the surroundings or from the water it is dissolving in, making the surroundings and the water feel cold. This is useful for sports medicine because when a cold pack is pressed against hot flesh, it will draw the heat out of the hot part of the body, thus cooling it off. The body is part of the surroundings to the cold pack reaction, and so heat from the body is absorbed into the cold pack. The energy the pack absorbs from the body can help continue the endothermic reaction, keeping the pack cold.

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Marisa Avery

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3y ago

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Related Questions

Instant cold packs can be reused?

Instant cold packs cannot be reused once they are activated. The chemical makeup inside the package was created for one time use.


Does nexcare instant cold packs have amonia nitrate?

According to the msds it should, if you can see 2640 written on it anywhere.


How can hand warmers and instant cold packs be effectively utilized for temperature regulation in outdoor activities?

Hand warmers and instant cold packs can be effectively utilized for temperature regulation in outdoor activities by activating them and placing them in pockets or gloves for warmth, or on the body for cooling. Hand warmers provide heat for cold weather, while instant cold packs can reduce body temperature in hot weather or treat injuries.


Can you refreeze or refrigerate an instant cold pack?

can you refreeze cold packs


How many instant cold packs are used each year?

Millions of instant cold packs are used each year for various purposes like first aid, sports injuries, and medical treatments. The exact number can vary depending on the demand and usage in different industries and regions.


Why can't you refreeze instant cold packs?

Refreezing instant cold packs can damage the chemicals inside and affect their ability to provide cooling when needed. The components in the pack may not refreeze evenly or may not reach the required temperature for effective cooling after being frozen a second time. It is best to follow the manufacturer's instructions and avoid refreezing instant cold packs for optimal performance.


What are some retailers that sell cold packs?

Cold packs can be purchased at most big box stores such as Walmart or Target in their first aid section. They are commonly known as ice packs where one can either break the bag to make instant cold to treat injuries or they can be shaken to create the same effect.


How cold does and instant cold pack get?

Instant cold packs typically reach temperatures around 32-41 degrees Fahrenheit (0-5 degrees Celsius) when activated. This temperature drop occurs quickly due to a chemical reaction that absorbs heat from the surroundings, making the pack feel cold to the touch.


What products contain ammonium nitrate?

Ammonium nitrate is commonly used as a high-nitrogen fertilizer and as an explosive in mining and construction. It can also be found in cold packs used for first aid, and in some types of instant cold packs due to its endothermic properties.


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Where can you find ammonium nirate?

Ammonium nitrate can be found in agriculture supply stores as a fertilizer, in some cold packs for injuries, and in some explosives used for mining and construction. It is important to handle and store ammonium nitrate carefully due to its potential for hazardous reactions.


How can I find an instant heat pack that is reusable?

You can find reusable instant heat packs at most drugstores or online retailers. Look for packs that can be reheated multiple times by boiling or microwaving.