Self-heating packaging utilizes a chemical reaction within the package to generate heat and warm up its contents without external heating sources. When activating the internal heating mechanism, an oxidizing agent and a fuel substance combine to produce an exothermic reaction. The heat from this reaction transfers to the food inside, raising its temperature to something safely edible.... https://logcla.com/blogs/349352/Self-heating-Food-Packaging-A-Revolutionary-Innovation-for-Outdoor-Meals