Flameless ration heaters (FRHs) are nontoxic, self-contained heating units that do not produce a flame. They were developed by the U.S. Army for use by soldiers in the field to heat their food. Use the Flameless Ration Heaters: An Applied Chemistry Demonstration—ChemTopic™ Lab Activity to showcase an interesting, real-world application of thermochemistry. Available as part of the Thermochemistry—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.