«The rapid exothermic reaction of potassium superoxide with the salt solutions results in the formation of insoluble oxide or hydroxide nanoparticulates.» (sciencedaily.com)
Another creation envisioned dropping an edible chemical compound into a tea cup that would automatically heat the water surrounding a tea bag through the release of exothermic energy as the chemical compound dissolved. (aaas.org)
A hybrid rocket propulsion system comprises propellants of two different states of matter, the most common configuration being a rocket engine composed of a solid propellant lining a combustion chamber into which a liquid or gaseous propellant is injected so as to undergo a strong exothermic reaction to produce hot gas that is emitted through a De Laval nozzle for propulsive purposes. (sciencedaily.com)