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Microwaves penetrate food and transfer energy into the thermal energy store of water molecules. There is then an energy transfer from the thermal energy store of the water molecules to the thermal energy stores of the food.
Infrared radiation won’t penetrate the food so will heat food more slowly. Infrared radiation is used in toaster, there is an energy transfer from the thermal energy store of the heating element to the thermal energy stores of the toast via infrared EM wave.
Infrared heaters use infrared radiation to transfer energy to the thermal energy store of the air particles. This causes the temperature of the room to increase.
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