Heating Methods
Commercial heat sources for self-heating food packaging use an exothermic reaction between quicklime, or calcium oxide, and water, which generates 60 calories of heat per gram. Quicklime, inexpensive and readily available, is generally recognized by the FDA as safe. The by-product of the reaction is calcium hydroxide.
For the military's Meals Ready to Eat or the flameless ration heater, the military uses a magnesium and iron heater. Water activates the heater, which generates heat of 310 calories per gram. Hydrogen is released as a byproduct. Civilian versions are available; it is rarely possible to buy packets individually from legitimate sellers.
Read more about this topic: Self-heating Food Packaging
Famous quotes containing the words heating and/or methods:
“If the factory people outside the colleges live under the discipline of narrow means, the people inside live under almost every other kind of discipline except that of narrow means—from the fruity austerities of learning, through the iron rations of English gentlemanhood, down to the modest disadvantages of occupying cold stone buildings without central heating and having to cross two or three quadrangles to take a bath.”
—Margaret Halsey (b. 1910)
“The comparison between Coleridge and Johnson is obvious in so far as each held sway chiefly by the power of his tongue. The difference between their methods is so marked that it is tempting, but also unnecessary, to judge one to be inferior to the other. Johnson was robust, combative, and concrete; Coleridge was the opposite. The contrast was perhaps in his mind when he said of Johnson: “his bow-wow manner must have had a good deal to do with the effect produced.””
—Virginia Woolf (1882–1941)