![]() ![]() According to EngineerGuy, a magnetron is two permanent magnets on either side of a vacuum tube. ![]() Microwaves pass through plastic, glass and ceramic but not metals, which is why it is not recommended to use metal containers or utensils in a microwave oven, according to SciTech.Ī magnetron generates the microwaves. Water molecules within the food absorb the microwaves, and the resulting vibrations generate heat and cook the food. Food that sits in a microwave oven is bombarded on all sides by the microwaves. Microwave ovens use radio waves set at a specific frequency - 2,450 megahertz with a power ranging from 500 to 1,100 watts, according to the World Health Organization (WHO). Today, approximately 90 percent of households in the United States have a microwave oven, according to the Bureau of Labor Statistics. homes had a microwave oven, according to Gallawa in 1976, the number jumped to 14 percent. Soon after, microwave ovens became more popular than even the dishwasher due to decreasing sizes and costs. Raytheon acquired Amana Refrigeration in 1965, and two years later, the Amana Radarange, which could fit on a kitchen countertop, was introduced. Tappan, an appliance maker, introduced the first microwave ovens for home use in 1955, but because of their large size - as big as a stove - and high cost - $1,295 - few were sold, according to Gallawa. Microwave ovens are also used to dry cork, ceramics, paper, leather, tobacco, textiles, pencils, flowers, wet books and match heads, according to Gallawa. Other industries also found uses for microwave heating. Other food industry establishments used microwaves for roasting coffee beans and peanuts, defrosting and precooking meat, and even shucking oysters. Restaurants could keep cooked recipes in the refrigerator and heat them to order reducing waste. It took a few years for the public to overcome their initial reluctance but as technology improved, microwave ovens grew in popularity, particularly in the food industry. It had to be hooked up to a water line because the magnetron was water-cooled. (340 kilograms) and cost $5,000, according to Gallawa. It stood 5.5 feet (1.7 meters) tall, weighed 750 lbs. Later that year, Raytheon introduced the Radarange 1161. The first commercial microwave oven was tested in a Boston restaurant in 1947. ![]()
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