Microwave energy is electromagnetic (EM) radiation, and microwave ovens use energy at a frequency of about 2450 MHz (2,450 million cycles per second). This energy is in the microwave band of frequencies, hence the term microwave oven. The frequency is a good choice, because it is quite effective in causing dielectric heating in molecules in the food. This is because there are a lot of molecules within the food that will respond to the microwave energy. These molecules, because they have an electric dipole, will attempt to align themselves with the passing electromagnetic wave. They will be trying to turn back and forth at that 2450 MHz, and this generates heat, which warms/cooks the food.
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microwave food is already cooked and put in the microwave to be heated stove cooked food is not already cooked and is cooked all the way on the stove