FRH is an abbreviation for "flameless ration heater," an water-activated exothermic chemical heater included with Meals, Ready-to-Eat (MREs), used to cook the food. US military specifications for the heater require that it be capable of raising the temperature of an eight-ounce entree by 100°F in twelve minutes, and that it display no visible flame.
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... a vast area between the Andes and the Atlantic Ocean, it borders Uruguay, Argentina, Paraguay, Bolivia, Peru, Colombia, Venezuela, Guyana, Suriname and French Guiana. Named ...