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Originally Posted by sabianq View Post
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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this statement makes no sense in context.
while yes, the material (food) that is being heated transfers part of its heat energy to the container (the bowl)
the microwave radiation does not directly heat the container, the energy goes into heating the food.
unlike a conventional oven where everything inside gets hot at the same time.
it is clear that the energy needed to heat one cup of water in a cup is far less in a microwave than it is in a conventional oven.
try this, take a toaster oven and a microwave oven and place a cup of water in each appliance. then set the toaster oven to say 300 degrees and turn on the microwave oven at the same time. now i would be willing to bet that the cup of water in the microwave oven will boil far faster than the cup of water in the toaster oven, and if they were both hooked up to an amp meter, i would bet that the toaster oven will use far more energy to boil the water. now when the microwave oven is finished boiling the water, you can stick your hand inside and the sides will be cool to the touch.
I have to ask, after the toaster oven is finished boiling the water, will the insides of the oven be cool to the touch?
what is stated is correct.
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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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i thought i said that
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it is not accurate to say that microwave ovens heat from the inside out
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While microwave radiation does penetrate the surface of food and start to heat the inside at roughly the same time as the surface, it's not necessarily accurate to say the food is cooked from the inside out. Microwaves heat food by being absorbed primarily by liquid water molecules, and to a lesser extent fats and some sugars, imparting energy to them in the form of heat...
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due to a mechanism called Dielectric heating...
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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
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all i said was that they work on the same frequency,
it should be self evident that microwaves do not radiate into free air unless yours is disassembled or faulty.
although i was thinking that rather build a weapon, one could build a WIFI amplifier by modulating the output of the magnetron.