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The speed that any material, or substance, heats in a microwave oven, is dependent upon it's length and it's conductivity. In other words, how good that it will work as an antenna, and/or as a wire for electricity. Details, below - if you care to know, with definition, explanation, and a little history........... This is because that, the microwave oven uses a very high frequency and power level, micro-bandwidth radio broadcasting signal = a magnetic field wave. It's so high in frequency and power, that it resonates in the molecules, and causes them to start jiggling and rubbing against each other which creates molecular friction, thereby creating heat, so the stuff gets hot. To "resonate" means to be at the frequency that causes an area, or an object to vibrate with that frequency. The frequency has to have a bandwidth where that one or more complete cycles can begin an end at zero inside of the area or object (but don't have to, begin and end at zero), or the area, or object, has to be, 1/2 , 1/4, 1/8 , 1/16, etc... the length of one complete wave, or cycle. The smaller the cut of the bandwidth(1/2 , 1/4, 1/8 , 1/16, etc...), the less the area or object will resonate. "Mico-" of course, means "very small". "Bandwidth" is how wide that one complete cycle of the signal is, which determines how long that a good antenna has to be. "One complete cycle" is one complete signal wave, which is the shape of a complete sine wave. A sine wave looks like a circle sliced in half horizontally, with the bottom half twisted 180 degrees, so that it makes a wave shape. The first end of the signal wave starts at zero, then goes up(positive), to it's "positive peak", then goes back down, below zero(negative) the same amount, to the other "peak", then goes back up to zero. When broadcasting begins, the signal starts at zero, and keeps going up and down until it's source stops broadcasting it. A signal's wave gets stretched in shape, vertically, when the amplitude = volume = power-level, increases, and it's waves get closer together when the frequency increases(and of course, the opposite(s) happen with the opposite(s)). If the microwave oven is empty, or dry, there's nowhere for the signal's power to go, or to be "dissipated". So the power will start going to the magnetron tube(which is the thing that puts out the high power, high frequency signal), and get it hotter and hotter, until it burns out. Conductors with sharp points like forks, will spark in a microwave oven. The idea for making microwave ovens, came from some electronic techs., that worked at a place, that broadcasted in hi-frequency, and they use to put some things from their lunch in the area that the microwaves were coming out - to heat it, since they knew from tech. school(-or college) that, "an antenna or a conductive material will get hot if a strong signal is received, but there's nowhere for the signal's power to go". If you care........ How they make a microwave popcorn bag pop the corn, is that they put a coating of a good conductor on, or in one area of the bag(-that's why it says, "this side down"). So, the conductor gets drastically hot, heats the margarine and/or oil (that they put in with the corn), and pops the corn. (Since you might be to young to know, popcorn use to be popped on the stove, in the oven, or in electric popcorn poppers, with, vegetable oil (-Try it...))
2016-04-08 00:49:54
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answer #5
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