Used words
                                    Ammonium
                                    Nitrate
                                    water
                                    NH4NO3
                                    dissolve
                                    endothermic
                                    reaction
                                    temperature
                                    cooling
                                    ions
                                    NH4+
                                    NO3-
                                    solubility
                                    pH
                                    chemical
                                    formula
                                    crystalline
                                    freeze
                                    cold
                                    ice
                                    relief
                                    swelling
                                    sprain
                                    injury
                                    first
                                    aid
                                    therapy
                                    headaches
                                    sports
                                    recovery
                                    pack
                                    squeeze
                                    instant
                                    sub
                                    5
                                    seconds
                                    solid
                                    liquid
                            
            
                
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