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Originally Posted by sabianq
Dielectric heating
the reason Microwave ovens work so fast is because they are very efficient.
and the energy that goes into heating say a cup of water goes into heating the water and not the cup.
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That's not correct. Different cup materials will retain more or less energy.
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it is not accurate to say that microwave ovens heat from the inside out
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Not inside out, but within
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Microwave ovens work at usually at a frequency of 2.45 GHz (a wavelength of 12.24 cm)
which is the same as a WIFI wireless router
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Yes, but microwave ovens do not radiate into free air, unless you disassemble one to make a radar or a HERF weapon
