Want to do a cool science experiment at home? Take some grapes, place them in the microwave, and turn it on. You get to see some cool plasma. If you want to learn the science behind plasma, this video from Veritasium is for you!
A bisected grape in the microwave makes plasma. But how does it work? A grape is the right size and refractive index to trap microwaves inside it. When you place two (or two halves) close together the fields interact with each other creating a maximum of electromagnetic energy where they touch. This creates heating, sparks, and plasma, which is further fed with energy directly by the microwaves.
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