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. 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.
Any form of cooking will destroy some nutrients in food, but the key variables are how much water is used in the cooking, how long the food is cooked, and at what temperature. Nutrients are primarily lost by leaching into cooking water, which tends to make microwave cooking healthier, given the shorter cooking times it requires. Like other heating methods, microwaving converts vitamin B12 from an active to inactive form; the amount of conversion depends on the temperature reached, as well as the cooking time. Boiled food reaches a maximum of 100 °C (212 °F) (the boiling point of water), whereas microwaved food can get locally hotter than this, leading to faster breakdown of vitamin B12. The higher rate of loss is partially offset by the shorter cooking times required.
It’s a good idea to clean your microwave regularly, even if you clean up spills or splatters here and there. To clean the inside, heat a microwave-safe bowl filled with water and a tablespoon of vinegar (white or apple cider will work) for several minutes. You want the inside to get steamy without the bowl of water to boiling over. Let the mixture cool for a few minutes before opening the door. Then, wipe the inside clean with a paper towel or use an abrasive sponge for any stuck-on food. Remove the turntable and either wash it by hand or in the dishwasher. Use an all-purpose cleaner for the exterior, but spray onto a paper towel or sponge first—not directly onto the microwave—to avoid it getting into the venting system. You should also avoid using bleach in your microwave.
Microwave heating can be deliberately uneven by design. Some microwavable packages (notably pies) may include materials that contain ceramic or aluminium flakes, which are designed to absorb microwaves and heat up, which aids in baking or crust preparation by depositing more energy shallowly in these areas. Such ceramic patches affixed to cardboard are positioned next to the food, and are typically smokey blue or gray in colour, usually making them easily identifiable; the cardboard sleeves included with Hot Pockets, which have a silver surface on the inside, are a good example of such packaging. Microwavable cardboard packaging may also contain overhead ceramic patches which function in the same way. The technical term for such a microwave-absorbing patch is a susceptor.
This GE microwave oven with a 16-inch turntable proves you don't need to spend a bundle to get perfectly "baked" potatoes, steamed broccoli, or evenly heated mac 'n cheese. Thanks to a smooth control panel with lettering that contrasts well with the background, it's super easy to read the display and wipe it clean. If stainless steel isn't your style, this model also comes in black and white.
This is a great microwave for power users who want complete control over their cooking — those often frustrated with overcooked leftovers or constantly sticking their finger in to check for cold spots. We didn’t mind spending a little extra time learning the features and extras we came to value, but it could be overkill for the average user looking for a familiar design.
A new microwave can provide extra options that you may not have not – including sensors for more accurate cooking times, inverter technology that creates more accurate power levels, and customized cooking menus for the food you love. If you do a lot of cooking, a modern microwave can also serve as an able assistance, with programmable defrosting, butter melting, and warm-up functions that make your cooking projects that much easier. One of these new models may also provide faster cooking times, child locks for great safety, and more consistent cooking/thawing for a variety of foods.
Fast cooking was our top priority — if a microwave can’t prepare a meal speedily, it isn’t the best. Ray Boxman, Professor Emeritus of Electrical and Electronics Engineering at Tel Aviv University, told us microwaves cook fast “because the microwave energy penetrates into the food, in contrast to conventional heating, which only delivers heat to the surface of the food, and a lot of time is needed for the heat to diffuse inward.”
A microwave with a convection function, like the Toshiba EC042A5C, offers multiple ways to cook your meals with one appliance. This 1,000-watt microwave has enough power to reheat food in microwave mode or cook, roast, and bake using the convection function between 170 and 425 degrees Fahrenheit. Featuring 1.5 cubic feet of space, it's large enough to microwave full-size dinner plates or accommodate a small chicken or pizza. A grill rack (for convection mode cooking) makes it easy to get a crispy exterior. People love this unit for its versatility, but others mention that it’s bigger and heavier than expected. It also may tack a few minutes onto recipe cook times when using convection mode.
If your primary concern is cooking speed, you need a microwave with higher wattage. The unit has to be large enough for your family's needs but not too large to fit in your kitchen. It is desirable to have quick keys, multi-stage cooking, and true variable power. Easy cleaning is a must because, at some point, you will need to wipe up after a cooking job.
You may be a bit limited in your choice of OTR microwaves because you’ll need a model that fits snugly above your stove. Most people also want an appliance that matches their range. And, unfortunately, OTR microwaves are more complicated to install, especially if you haven’t had one before. In these instances, you may need to hire an electrician, which can drive up the overall cost of your new microwave.
Japan's Sharp Corporation began manufacturing microwave ovens in 1961. Between 1964 and 1966, Sharp introduced the first microwave oven with a turntable, a feature that promotes convenient even heating of food. In 1965, Raytheon acquired Amana. In 1967, they introduced the first popular home model, the countertop Radarange, at a price of US$495 ($4,000 in 2018 dollars).