Uneven heating in microwaved food can be partly due to the uneven distribution of microwave energy inside the oven, and partly due to the different rates of energy absorption in different parts of the food. The first problem is reduced by a stirrer, a type of fan that reflects microwave energy to different parts of the oven as it rotates, or by a turntable or carousel that turns the food; turntables, however, may still leave spots, such as the center of the oven, which receive uneven energy distribution. The location of dead spots and hot spots in a microwave can be mapped out by placing a damp piece of thermal paper in the oven. When the water saturated paper is subjected to the microwave radiation it becomes hot enough to cause the dye to be released which will provide a visual representation of the microwaves. If multiple layers of paper are constructed in the oven with a sufficient distance between them a three-dimensional map can be created. Many store receipts are printed on thermal paper which allows this to be easily done at home.[40]
The 1.2-cubic-foot Toshiba didn’t heat as evenly as the smaller Toshiba. Unlike the 0.9-cubic-foot version, this Toshiba uses a steam and temperature sensor to automatically determine cooking time. However, we didn’t find the sensor particularly accurate: The baked potato we cooked using it came out completely raw in the center. In our heat map test, the marshmallows near the center of the turntable came out very dark. That said, it heated more evenly across the surface of the turntable than most of the microwaves we tested. The popcorn we made wasn’t burned, though it did have twice as many unpopped kernels as the 0.9-cubic-foot model. We liked that this model beeps to prompt you to flip meat while defrosting, something the smaller one doesn’t do. Impressively, this Toshiba only slightly cooked the edges of ground beef on the defrost mode, unlike most of the models we tested, which fully cooked entire sections of meat.
The affordable Toshiba EM925A5A-BS microwave is simple to use, with a plainly labeled keypad and intuitive controls. It cooked popcorn, baked potatoes, and frozen mac and cheese perfectly every time, and its mute button—a rare feature that lets you stealthily reheat midnight snacks without waking your housemates. We also appreciated the express cooking option, which immediately starts the microwave with a press of one of the numbered buttons (from 1 to 6 minutes). A dedicated plus-30-seconds button helps further fine-tune cook times. The compact 0.9-cubic-foot Toshiba model is large enough to fit an 11-inch dinner plate or a 9-inch square casserole dish. It’s also available in a stainless steel or black stainless steel exterior.

Capacity is a measurement of the inside cooking space in your microwave, and it can vary drastically from model to model. In other words, the dishes that fit into your old microwave may not fit into a new one…which is why capacity is an important feature for the best microwave brand. It needs to at least hold a dinner plate. Microwaves below 1 cu ft may not be large enough for all plates, platters, or tall mugs. Saving space is great, but don’t do it at the expense of the dishes you prefer to microwave.
Reviewers can’t contain their delight about this microwave’s Genius Sensor, which automatically adjusts the time and power based on the food type. “It feels very futuristic to press the Sensor Heat and let the microwave figure out on its own how long it should cook for. Most of the time, it’s dead-on, too, which is nice,” praises one commenter. “It’s pretty much impossible to overcook something,” writes another. Others note they “have had nothing boil over” and it “cooks super evenly. The days of half-molten-half-frozen food are gone.” Its modern exterior is another strong selling point. “The stainless steel looks very sleek and nice and will fit in with most kitchens,” one says.
^ Gallawa, J Carlton (1989). "A Brief History of the Microwave Oven". The complete microwave oven service handbook : operation, maintenance, troubleshooting, and repair. Englewood Cliffs, N.J.: Prentice Hall. ISBN 9780131620179. OCLC 18559256. Retrieved 11 October 2017. Chapter link is hosted at the Southwest Museum of Engineering, Communication and Computation; Glendale, Arizona.
Another hazard is the resonance of the magnetron tube itself. If the microwave is run without an object to absorb the radiation, a standing wave will form. The energy is reflected back and forth between the tube and the cooking chamber. This may cause the tube to overload and burn out. High reflected power may also cause magnetron arcing, possibly resulting in primary power fuse failure, though such a causal relationship isn't easily established. Thus, dehydrated food, or food wrapped in metal which does not arc, is problematic for overload reasons, without necessarily being a fire hazard.
A microwave oven heats food by passing microwave radiation through it. Microwaves are a form of non-ionizing electromagnetic radiation with a frequency in the so-called Microwave Region (300 MHz to 300 GHz). Microwave ovens use frequencies in one of the ISM (industrial, scientific, medical) bands, which are otherwise used for communication amongst devices that don't need a license to operate, so they do not interfere with other vital radio services.
This microwave tells you exactly how long your food is cooking — a feature that seems like a given, but isn’t. When we cooked potatoes in testing, some of the microwaves with moisture sensors would cook for as long as five minutes with a few dots circling around the display, no indication of time. If you’re trying to follow a recipe or keep an eye out for overheating, these displays make it difficult to keep track of time.
If you really want microwave power levels that function accurately, look for a microwave with an inverter. What is an inverter microwave? Essentially, it uses a different type of microwave production that actually does change the power levels and heating. Set power to 5, and the inverter will make sure heating is at 50%. Other types of microwaves will use a cycling method, where the power is always set to 100% but at level 5 it cycles half as much as at level 10. Inverter technology tends to make power levels much more effective and sensible, but either way it’s important to know what you’re getting into.
Another misconception is that microwave ovens cook food "from the inside out", meaning from the center of the entire mass of food outwards. This idea arises from heating behavior seen if an absorbent layer of water lies beneath a less absorbent drier layer at the surface of a food; in this case, the deposition of heat energy inside a food can exceed that on its surface. This can also occur if the inner layer has a lower heat capacity than the outer layer causing it to reach a higher temperature, or even if the inner layer is more thermally conductive than the outer layer making it feel hotter despite having a lower temperature. In most cases, however, with uniformly structured or reasonably homogenous food item, microwaves are absorbed in the outer layers of the item at a similar level to that of the inner layers. Depending on water content, the depth of initial heat deposition may be several centimetres or more with microwave ovens, in contrast to broiling/grilling (infrared) or convection heating—methods which deposit heat thinly at the food surface. Penetration depth of microwaves is dependent on food composition and the frequency, with lower microwave frequencies (longer wavelengths) penetrating further.[citation needed]
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For most people, microwaves are a must-have kitchen appliance for meal prep. Whether you want to popcorn or a warm bowl of soup, a microwave will get the job done in mere minutes. Plus, there's nothing to preheat, which helps you conserve energy in your home. Their convenience and ease of use are what make microwaves a staple for most modern households.
One complaint of some Amazon reviewers is that the Toshiba is loud while operating. Others complain that the door makes a racket when closed. We’ve also read reviews that the control panel’s plastic membrane begins to bubble or peel over time. Since this is a relatively new model, there’s not a long track record of how it will hold up over the long run. But we’ll continue to long-term test it to keep an eye on these issues.
One touch buttons take care of all the work for you. We particularly like the buttons that combine sensors with a preprogrammed cooking time to automatically adjust based on the food you put inside the microwave. One touch buttons for common foods like popcorn, potatoes, hot dogs and more are also a plus – as are time-saving buttons for immediate reheating, melting, defrosting, and so on.
What is a microwave ovens role in your home? Do you need the best compact microwave to fit on a tiny counter and travel with you when you switch apartments? Do you need the best built in microwave that works with your oven range? No matter your kitchen appliance situation, if you’re stuck with a clunky, ugly microwave, it’s time to improve your cooking situation.
Closed containers, such as eggs, can explode when heated in a microwave oven due to the increased pressure from steam. Intact fresh egg yolks outside the shell will also explode, as a result of superheating. Insulating plastic foams of all types generally contain closed air pockets, and are generally not recommended for use in a microwave, as the air pockets explode and the foam (which can be toxic if consumed) may melt. Not all plastics are microwave-safe, and some plastics absorb microwaves to the point that they may become dangerously hot.
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Reviewers can’t contain their delight about this microwave’s Genius Sensor, which automatically adjusts the time and power based on the food type. “It feels very futuristic to press the Sensor Heat and let the microwave figure out on its own how long it should cook for. Most of the time, it’s dead-on, too, which is nice,” praises one commenter. “It’s pretty much impossible to overcook something,” writes another. Others note they “have had nothing boil over” and it “cooks super evenly. The days of half-molten-half-frozen food are gone.” Its modern exterior is another strong selling point. “The stainless steel looks very sleek and nice and will fit in with most kitchens,” one says.
There’s no keypad, and you’ll have to twist a dial to program anything over 30 seconds. After some initial acquainting, we found those differences made programming simple. We weren’t completely ignoring presets and extra keys like we all do on our ordinary microwaves, instead we found ourselves able to specify exactly what we wanted done — without having to consult the user’s manual.
Finish: The finish may not affect performance, but it does play an important role in coordinating your unit with the rest of the appliances in your kitchen. Stainless steel microwaves provide a sleek contemporary look. Black microwaves are more discreet and tend to take up less visual space in your kitchen. White, gray and colorful options are also available.
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