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> Microwaves are highly tuned to the particular frequency that causes water molecules to resonate.

That's an urban legend. If it was true, they'd be great rather than "meh" at melting ice, and (I appreciate most don't do this anyway) we wouldn't be able use domestic ovens for glass-working or melting alumina to make synthetic sapphires and rubies.

• https://youtu.be/XojnG2IFfTo

• https://youtu.be/xwEQZw3KPWg

• https://youtu.be/ybcdRQmQcHQ

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Good points, but careful of the logic; yes there's a lot of energy being produced and plenty of harmonics etc. None of which says that every material heats equally well, with no passthrough, or that microwave ovens with different frequencies wouldn't be more efficient for other specific materials.

If a material is dense enough (metal being the prime example) it'll block. I've nowhere argued that you could send microwave power through solid walls - whether brick or sapphire economically.

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