Exothermal and Endothermal cup
grabcad
This straightforward design can cater to various scenarios, particularly camping and military use. To operate it, add chemicals in the exhaust cup, followed by water. Stir the mixture, place the cup with desired contents, then discard the exhaust cup after heating or cooling is achieved. Note that this is a concept; future advancements are anticipated. Please feel free to ask for chemical details.
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