cold pack reaction is a kind of endothermic reaction
endothermic_reaction is endergonic_reaction. endoergic_reaction is nuclear_reaction. endothermic_reaction is not chemical_reaction. exothermic_reaction is heat_production. endothermic_reaction is not endergonic_reaction. exothermic_reaction is not heat_production. endoergic_reaction is not nuclear_reaction. endothermic_reaction is chemical_reaction.