From the late 1970s, Japanese companies such as Sharp Corporation manufactured low-cost microwave ovens that were affordable for residential use, leading to the rapid expansion of the microwave oven market in the 1980s. After Japanese dominance for much of the 1980s, with Sharp as market leader, South Korean manufacturers began entering the market in the late 1980s, with Samsung becoming a major microwave manufacturer.[18]

If you need a new oven range microwave, then it needs to have the right features for your oven setup. Not only does it need to fit in the same space, but it also needs to handle the same (if any) venting capabilities. Our GE pick is a great option because it can fit in many different types of kitchens, but you need to match features to your requirements.
Its high-tech capabilities don’t seem to cause complications, and reviewers find it easy to set up. A visually impaired reviewer writes: “I’m always hesitant when I buy something that needs to be paired with something else in order to get the full benefit of it. Sometimes, something on the screen needs to be entered which we can’t see. There might be on-screen prompts or whatnot. This microwave had none of that. It was a cinch to set up and works beautifully.” Others love its small size. “We have a VERY small kitchen with barely any counter space so I was very pleased with how compact it is,” writes one commenter.
In 2000, some manufacturers began offering high power quartz halogen bulbs to their convection microwave models,[37] marketing them under names such as "Speedcook", "Advantium", "Lightwave" and "Optimawave" to emphasize their ability to cook food rapidly and with good browning. The bulbs heat the food's surface with infrared (IR) radiation, browning surfaces as in a conventional oven. The food browns while also being heated by the microwave radiation and heated through conduction through contact with heated air. The IR energy which is delivered to the outer surface of food by the lamps is sufficient to initiate browning caramelization in foods primarily made up of carbohydrates and Maillard reactions in foods primarily made up of protein. These reactions in food produce a texture and taste similar to that typically expected of conventional oven cooking rather than the bland boiled and steamed taste that microwave-only cooking tends to create.
In the 1960s,[specify] Litton bought Studebaker's Franklin Manufacturing assets, which had been manufacturing magnetrons and building and selling microwave ovens similar to the Radarange. Litton then developed a new configuration of the microwave: the short, wide shape that is now common. The magnetron feed was also unique. This resulted in an oven that could survive a no-load condition: an empty microwave oven where there is nothing to absorb the microwaves. The new oven was shown at a trade show in Chicago,[citation needed] and helped begin a rapid growth of the market for home microwave ovens. Sales volume of 40,000 units for the U.S. industry in 1970 grew to one million by 1975. Market penetration was faster in Japan, due to a re-engineered magnetron allowing for less expensive units. Several other companies joined in the market, and for a time most systems were built by defense contractors, who were most familiar with the magnetron. Litton was particularly well known in the restaurant business.
Spinach retains nearly all its folate when cooked in a microwave; in comparison, it loses about 77% when boiled, leaching out nutrients. Bacon cooked by microwave has significantly lower levels of carcinogenic nitrosamines than conventionally cooked bacon.[44] Steamed vegetables tend to maintain more nutrients when microwaved than when cooked on a stovetop.[44] Microwave blanching is 3–4 times more effective than boiled water blanching in the retaining of the water-soluble vitamins folic acid, thiamin and riboflavin, with the exception of ascorbic acid, of which 28.8% is lost (vs. 16% with boiled water blanching).[47]

Adoption has been slower in less-developed countries, as households with disposable income concentrate on more important household appliances like refrigerators and ovens. In India, for example, only about 5% of households owned a microwave in 2013, well behind refrigerators at 31% ownership.[24] However, microwave ovens are gaining popularity. In Russia, for example, the number of households with a microwave grew from almost 24% in 2002 to almost 40% in 2008.[25] Almost twice as many households in South Africa owned microwaves in 2008 (38.7%) as in 2002 (19.8%).[25] Microwave ownership in Vietnam was at 16% of households in 2008—versus 30% ownership of refrigerators; this rate was up significantly from 6.7% microwave ownership in 2002, with 14% ownership for refrigerators that year.[25]
Every microwave oven contains a magnetron, which generates microwaves. Those waves are then guided into the oven’s cavity, where they bounce around, rapidly swinging the polarity of charged molecules in foods (particularly water, fats, and sugars) and generating heat. Metal mesh on the door keeps those large-wavelength microwaves from escaping the metal box and cooking you. (This great video uses a disassembled model to explain further.)
Food and cookware taken out of a microwave oven are rarely much hotter than 100 °C (212 °F). Cookware used in a microwave oven is often much cooler than the food because the cookware is transparent to microwaves; the microwaves heat the food directly and the cookware is indirectly heated by the food. Food and cookware from a conventional oven, on the other hand, are the same temperature as the rest of the oven; a typical cooking temperature is 180 °C (356 °F). That means that conventional stoves and ovens can cause more serious burns.
It’s a rare compact model that comes equipped with 10 power levels, but this AmazonBasics model offers them. It also has Alexa voice control, which feels almost too futuristic for a microwave. You save on space without giving up much of anything with this model, which we call a solid win! This 0.7 cubic ft microwave is awesome and worth the counter space. The control panel is easy to use and laid out well.
The Toshiba EM925A5A-BS cooked the most evenly in our tests and was one of the few models we found with an option to mute the sound. The Toshiba has a control panel that’s very easy to use and includes express cooking options and preset cooking functions for specific tasks like making popcorn or cooking a potato. Also, the Toshiba is one of the few models we tested with a handle for opening the door (versus a push-button release), which some people may prefer.
Microwave ovens come in a variety of styles to fit all your home decor needs. It doesn’t matter if we are talking about otr microwaves or countertop microwaves. Some are black stainless steel, others are shiny stainless steel finish for the modern kitchen. If you have retro decor, there is also a retro microwave for you. Many people prefer a stainless steel exterior. It is easy to find the right model that blends right into your kitchen and matches your, espresso machines, food processors, coffee makers, air fryers and other appliances. Many of today’s models can even work with other smart home devices if your home is a smart home.
Any object containing pointed metal can create an electric arc (sparks) when microwaved. This includes cutlery, crumpled aluminium foil (though some foil used in microwaves is safe, see below), twist-ties containing metal wire, the metal wire carry-handles in paper Chinese take-out food containers, or almost any metal formed into a poorly conductive foil or thin wire, or into a pointed shape.[57] Forks are a good example: the tines of the fork respond to the electric field by producing high concentrations of electric charge at the tips. This has the effect of exceeding the dielectric breakdown of air, about 3 megavolts per meter (3×106 V/m). The air forms a conductive plasma, which is visible as a spark. The plasma and the tines may then form a conductive loop, which may be a more effective antenna, resulting in a longer lived spark. When dielectric breakdown occurs in air, some ozone and nitrogen oxides are formed, both of which are unhealthy in large quantities.
Some magnetrons have ceramic insulators with beryllium oxide (beryllia) added. The beryllium in such oxides is a serious chemical hazard if crushed then inhaled or ingested. In addition, beryllia is listed as a confirmed human carcinogen by the IARC;[citation needed] therefore, broken ceramic insulators or magnetrons should not be handled. This is a danger if the microwave oven becomes physically damaged, if the insulator cracks, or when the magnetron is opened and handled, yet not during normal usage.
The second problem is due to food composition and geometry, and must be addressed by the cook, by arranging the food so that it absorbs energy evenly, and periodically testing and shielding any parts of the food that overheat. In some materials with low thermal conductivity, where dielectric constant increases with temperature, microwave heating can cause localized thermal runaway. Under certain conditions, glass can exhibit thermal runaway in a microwave to the point of melting.[41]
Panasonic uses a supposedly superior power-regulating mechanism called an inverter, which can deliver continuous heating at varying strengths—50 percent power, for example, means continuous delivery at 50 percent of the unit’s max. Most other manufacturers use a cheaper and more common technology, a transformer, which means that it delivers 50 percent power by cycling between periods of full power and zero power. Panasonic’s inverter technology is supposed to cook more evenly, but Franke told us, “I’ve never found that [an inverter] necessarily means the oven performs better.” The Panasonic models we tested cooked potatoes and frozen meals well, but they overcooked the edges of frozen ground beef using the defrost mode. In the end, we don’t think paying more specifically for inverter technology is worth it.
Frozen dinners, pies, and microwave popcorn bags often contain a susceptor made from thin aluminium film in the packaging or included on a small paper tray. The metal film absorbs microwave energy efficiently and consequently becomes extremely hot and radiates in the infrared, concentrating the heating of oil for popcorn or even browning surfaces of frozen foods. Heating packages or trays containing susceptors are designed for a single use and are then discarded as waste.
It’s a rare compact model that comes equipped with 10 power levels, but this AmazonBasics model offers them. It also has Alexa voice control, which feels almost too futuristic for a microwave. You save on space without giving up much of anything with this model, which we call a solid win! This 0.7 cubic ft microwave is awesome and worth the counter space. The control panel is easy to use and laid out well.

Reviewers of this multipurpose microwave celebrate its great value. “This is the best microwave I’ve ever owned under $200. It works great and it arrived in less than 24 hours. Color me impressed,” writes one. In addition to microwaving food, it includes a convection function for baking or roasting and a broil setting with a removable grill rack. “This oven seems to do everything that I wanted it to do. It … makes fast work of anything I put in it,” says one. “The browner element on the top is just icing on the cake.” Another happy customer writes: “This was my only way to cook for six weeks during flood repair of my kitchen. We were able to have normal meals without going out every time.”

Our microwave buying guide has everything you need to make the right choice for your kitchen, but if you buy on Amazon, check out every Amazon reviewer for your favorite models and see what they had to say. After all, they have already purchased it. To see it in person, go to a store like Home Depot and get a first-hand look at all of their microwave ovens, overtherange microwave
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.
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]