Formerly discovered only in large industrial purposes, microwave ovens more and more grew to become a normal fixture of residential kitchens in developed nations. By 1986, roughly 25% of households in the U.S. owned a microwave oven, up from solely about 1% in 1971; the U.S.
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These reactions in food produce a texture and taste similar to that sometimes anticipated of conventional oven cooking quite than the bland boiled and steamed style that microwave-only cooking tends to create. Microwave heating could cause localized thermal runaways in some materials with low thermal conductivity which also have dielectric constants that increase with temperature.
An example is glass, which might exhibit thermal runaway in a microwave to the purpose of melting if preheated. Additionally, microwaves can soften sure types of rocks, producing small portions of molten rock. Some ceramics can also be melted, and may even turn into clear upon cooling. Thermal runaway is extra typical of electrically conductive liquids corresponding to salty water.
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In France, 40% of households owned a microwave oven in 1994, but that number had elevated to 65% by 2004. This patent proposed radio frequency heating, at 10 to 20 megahertz (wavelength 30 to fifteen meters, respectively). Nevertheless, the first heating effect of all forms of electromagnetic fields at both radio and microwave frequencies occurs by way of the dielectric heating impact, as polarized molecules are affected by a quickly alternating electrical area.
Bureau of Labor Statistics reported that over ninety% of American households owned a microwave oven in 1997. In Australia, a 2008 market research research found that ninety five% of kitchens contained a microwave oven and that eighty three% of them have been used day by day. In Canada, fewer than 5% of households had a microwave oven in 1979, but greater than 88% of households owned one by 1998.