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How Microwaves Cook Food. When you hit the start button it usually takes about 2 seconds to heat up a filament inside the magnetron tube, says Schiffmann. The microwaves are then blasted into the food compartment. The commonly used frequency of microwaves, 2.45 gigahertz, is easily absorbed by water, fat, and sugar.
How Convection Microwave Ovens Work. If youâve been shopping for a new microwave, youâve probably noticed some more expensive models that offer convection cooking. If youâre like me, you may have initially wondered what convection microwave ovens do and why theyâre pricier than standard microwaves. Put simply, convection microwave ovens use a fan to circulate hot air inside the microwave, browning and crisping food at lower temperatures. Other benefits of convection cooking include: Faster baking and roasting