The defrost options (varying by type or weight) are ideal if you want to warm something up with the microwave before cooking with the convection setting. If you have a busy kitchen and want multiple ways to cook foods (instead of just nuking the occasional popcorn bag), Cuisinart delivers. About the only thing that it’s missing is the ability to set power levels, but with all these other features, that’s a minor quibble to be had.
Consumer ovens work around a nominal 2.45 gigahertz (GHz) — a wavelength of 12.2 centimetres (4.80 in) in the 2.4 GHz to 2.5 GHz ISM band— while large industrial/commercial ovens often use 915 megahertz (MHz) — 32.8 centimetres (12.9 in). Water, fat, and other substances in the food absorb energy from the microwaves in a process called dielectric heating. Many molecules (such as those of water) are electric dipoles, meaning that they have a partial positive charge at one end and a partial negative charge at the other, and therefore rotate as they try to align themselves with the alternating electric field of the microwaves. Rotating molecules hit other molecules and put them into motion, thus dispersing energy. This energy, dispersed as molecular rotations, vibrations and/or translations in solids and liquids raises the temperature of the food, in a process similar to heat transfer by contact with a hotter body. It is a common misconception that microwave ovens heat food by operating at a special resonance of water molecules in the food. As noted microwave ovens can operate at many frequencies.
In 1945, the heating effect of a high-power microwave beam was accidentally discovered by Percy Spencer, an American self-taught engineer from Howland, Maine. Employed by Raytheon at the time, he noticed that microwaves from an active radar set he was working on started to melt a chocolate bar he had in his pocket. The first food deliberately cooked with Spencer's microwave was popcorn, and the second was an egg, which exploded in the face of one of the experimenters. To verify his finding, Spencer created a high density electromagnetic field by feeding microwave power from a magnetron into a metal box from which it had no way to escape. When food was placed in the box with the microwave energy, the temperature of the food rose rapidly. On 8 October 1945, Raytheon filed a United States patent application for Spencer's microwave cooking process, and an oven that heated food using microwave energy from a magnetron was soon placed in a Boston restaurant for testing.
The 1,250-watt rating is enough to nuke even thick foods easily, the 2.2 cubic capacity is large enough for most dishes, and the slick screen interface makes it easy to choose from 10 power levels and sensors that detect moisture and more. Unless you absolutely need an over-the-range microwave, this Panasonic model will bring you into the new age quick cooking. Keep reading to learn more about the Panasonic and the other 9 microwaves that made the list.
Like most microwaves we tested, the Toshiba wasn’t great at defrosting meat. This model doesn’t beep to remind you to flip the meat halfway through heating, so if you forget, the results are pretty unappetizing. The ground beef we attempted to defrost in this Toshiba remained partially frozen in the center, while the edges were slightly cooked. For that reason, we don’t ever recommend using a microwave for defrosting meat unless you absolutely have to. It’s always best to thaw meat in the fridge or under cold running water. That said, we still think the defrost mode is great for quickly thawing frozen bread or bagels.
You’ll find the perfect microwave from our microwaves Black Friday 2019 collection. Treat yourself to a microwave that is outfitted with features you’ll use frequently. There are many different features a microwave can have, including auto defrost, sensor cooking and shortcut keys. Check out our Microwave Buying Guide for more information on each feature and how they can simplify getting dinner on the table.