Jisho

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ほれいざい 保冷剤
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Noun
1. refrigerant; thermal gel; ice pack; cold pack​
Wikipedia definition
2. Ice pack​An ice pack or gel pack is a plastic sac of ice, refrigerant gel or liquid, or, in an emergency, even frozen vegetables. The refrigerant, usually non-toxic, can absorb a considerable amount of heat, since its enthalpy of fusion is high. It is commonly used as a cold compress to alleviate the pain of minor injuries or in coolers or insulated shipping containers to keep products cool during transport. The simplest type of ice pack is simply a sack, bag or towel filled with cubed or crushed ice.
Read “Ice pack” on English Wikipedia
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