>>12526263That's what a microwave is, but for water molecules. Unfortunately, other things have absorption at that frequency, so you will have to heat other stuff up to. It doesn't have the selectivity of a radio since radios have gain at specific frequencies (one frequency eclipses all others really) but in a microwave you have to heat anything that reacts to this frequency (isn't transparent at whatever frequency)
>>12526254The grape plasma thing is cool; who cares who made the video? Even though the gel of the grapes does not reflect nearly as well as metal, you can still get a big big electric field thanks to resonance. The grapes are (I'm kinda guessing) about 1.5 wavelengths (since microwave wavelength is like ~1cm) and this is a harmonic of the wave. Since we have a harmonic of building up reflected waves, after some time they get really big and you still get plasma.
Also, you generally don't want to pass current through plasma in an efficiency type way because a bunch of energy goes to heat and light, ala those long gas lightbulbs. Not really an expert on plasma physics, just know the beginnings. Also, it getting hot makes the gas want to expand, and this makes the plasma dissolve/ dissociate/ go away.
