Cut a grape in half but leave the skin of one side intact, Place the grape in the microwave and crank up the microwave radiation. Viola, the grape bursts into a brilliant, white-hot flame. The same effect occurs with two grapes in a microwave that touch each other. The flame you see is plasma – a hot mixture of electrons and electrically charged atoms, or ions. Scientists only recently discovered why the grapes burst into flames. They used to think grapes acted like antennas, collecting microwaves. Now they understand that grapes in a microwave act as resonators, not antennas. Like a musical instrument that resonant sound waves, a grape in a microwave resonates microwave radiation. In other words, the waves of radiation get trapped inside…
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