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Manoj
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What is Microwave Oven and how does it work ? Empty What is Microwave Oven and how does it work ?

on Tue Jan 15, 2019 3:33 pm
hi
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:35 pm
The first microwave oven that was made by Raytheon was 6 feet tall and weighed at least 750 pounds. Most people did not buy them because they cost about $5000.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:35 pm
By 1967 microwave ovens had come down in price and in size. They were approximately $495, but this was still expensive. At least they could fit on a counter top thanks to redesigning and improvements in technology.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:35 pm
The first commercial microwave oven was created in 1946, and by the mid-1990s 90% of the homes in the United States owned one.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:35 pm
Although microwaves emit radiation (as Dr. Spencer discovered when his chocolate bar melted in his pocket), it is not dangerous or cancer-causing because the microwaves are non-ionizing. You won't get cancer from your microwave, unlike the potential from x-rays.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:35 pm
Most people believe that microwaves cook from the inside out. This is not true. Similar to the way other types of heat cook food, microwaves cook from the outside inward.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:35 pm
When a microwave is running there are microwaves being absorbed by the food or liquid. If there is nothing in the microwave, the waves reflect between the cooking chamber and the tube, and will burn the magnetron out. Microwave cooking requires some water in the food in order to work.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:36 pm
Watching food cook in a microwave is not dangerous as some believe. The mesh in the glass window stops the microwaves from reaching you, and only light is able to pass through to your eyes.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:36 pm
The microwave was designed to use a magnetron to create the microwaves that cook or heat food or liquid.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:36 pm
NASA uses microwave technology for communication in deep space.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:36 pm
The first microwaves were cooled by water but they were later changed to be cooled by air.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:36 pm
The type of radiation that is used in microwave ovens is also used in speed cameras used by police, radar, and cell phones.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:37 pm
Microwaves are also used for broadcasting television, treating muscle aches and pains, curing rubber, making bread rise, and curing plywood.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:37 pm
Some scientists and researchers believe that cooking food in a microwave changes it to the point that it becomes carcinogenic (cancer causing) in some cases.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:37 pm
Some believe that by cooking food with microwaves, nutrients such as vitamins and minerals are decreased or even destroyed.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:37 pm
The microwave inventor Dr. Percy Spencer lived to 76 with no apparent health consequences from working around microwaves for much of his adult life.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:38 pm
Apparently no one thought of cooking food with microwaves until the 1940s, when a self-taught engineer named Percy Spencer was building radar equipment in a lab for Raytheon, and noticed that a chocolate bar he had in his pocket started to melt.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:38 pm
Microwave radiation is a form of non-ionizing radiation (meaning it can't directly break up atoms or molecules) that lies between common radio and infrared frequencies. So it is not thought to damage DNA of living things, the way X and gamma rays do.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:38 pm
Most microwave ovens hit food with microwaves at a frequency of 2.45 gigahertz (GHz) (a wavelength of 12.24 centimetres (4.82 in)). The prevailing belief is that molecules in the food, particularly water, absorb energy from the waves through dielectric heating.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:38 pm
Although many people believe this to be the case, microwaves actually work on the outer layers of food, heating it by exciting the water molecules there. The inner parts of food are warmed as heat transfers from the outer layers inward. This is why a microwave can only cook a big hunk of meat to a depth of about one inch inward.

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Dhruv singhaniya
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on Tue Jan 15, 2019 3:39 pm
Metals reflect microwaves, whereas plastic, glass and ceramics allow them to pass through. That means metals don't appreciably heat up in a microwave oven. However, thin pieces of metal, such as foils or the tines of a fork, can act as antenna, and the waves can arc off them, forming dramatic sparks.

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Dhruv singhaniya
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on Tue Jan 15, 2019 3:39 pm
A complete analysis of cooking efficiency depends on a number of factors, including what you are trying to prepare and the cost -- and greenness -- of your local supply of electricity, gas or other fuel.
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Dhruv singhaniya
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on Tue Jan 15, 2019 3:39 pm
Oils such as olive oil do not heat well in microwaves because their molecules lack the polarity found in water. It's also true that frozen butter is hard to thaw in a microwave, because the bulk of the substance is oil, and the portion of water present is in the form of ice, which keeps the molecules locked up in crystal form, making oscillation more difficult.

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Dhruv singhaniya
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on Tue Jan 15, 2019 3:39 pm
The safest course of action is to avoid putting any plastics in the microwave. When the Milwaukee Journal Sentinel tested plastics labeled microwave-safe and advertised for infants, even those were found to release "toxic doses" of Bisphenol A when heated in a microwave
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Dhruv singhaniya
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What is Microwave Oven and how does it work ? Empty Re: What is Microwave Oven and how does it work ?

on Tue Jan 15, 2019 3:39 pm
One potential danger of microwave ovens is getting scalded by over heated water. What can happen is that when plain water is heated in a microwave in a clean ceramic or glass container for too long, it can prevent bubbles from forming, which normally cool it down.
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