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Automatic heating without fire ~
This is not news because it has existed a long time. But only now my question about it just popped out from nowhere.
Wilhelm Espenhayn and Rriedrich Oswald Hunger patented in 1906 (I didn't know it was as early as that though) the automatic or self heating tin of food or drink. The principals of such functioning has hardly changed during more than a century.
There are 2 compartments apart from the space that contains the food or drink. One of them has in it live Cal (Oxide of calcium CaO), and in the other, water. To heat the food you need to break the seal that separates the 2 compartments. When the 2 substances enter in contact, it produces a exothermic reaction that emitting heat. Just 5 minutes is enough to warm up the contents to 40 degree centigrade.
My question is: Why is this not more generally used? How often, and where, do you find tins like that in supermarkets or anywhere else? I do realize every home is equipped with a microwave oven. But for outdoors, quick office lunches, afternoon drink while working, watching an exciting film on TV at late night and you don't wish to leave your settee ... etc.
Tags: dualhosting, selfheating
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