| 摘要 |
A cooling pack the operation of which is based on an endothermic chemical reaction and a process for its production. The pack comprises two hermetically sealed compartments one of which contains a substance (5) which is endothermically soluble in water such as ammonium nitrate and the second of which contains a substance (9) which is endothermically soluble in water such as decahydrated soda crystals and a saturated aqueous solution thereof (10). On breaking the hermetic seal (6) between the two compartments the contents thereof are mixed and react endothermically to produce a cooling effect. <IMAGE> |
