cold pack reaction is a kind of endothermic reaction
endergonic_reaction is chemical_reaction. exoergic_reaction is nuclear_reaction. endothermic_reaction is chemical_reaction. endoergic_reaction is nuclear_reaction. exothermic_reaction is heat_production. endothermic_reaction is endergonic_reaction. slake_reaction is exothermic_reaction. exothermic_reaction is chemical_reaction.