> molecules, and may others, cannot.  Please let me know if this explanation
> is unsatisfactory, or not technical enough.

Worth noting that all sorts of other non water containing materials are
variably absorbative (?) of RF at that frequency. Some plastic (very
possibly due to Hydrogen bonds also) are quite affected while others not at
all.

The classic way to get absorption is to provide a shorted turn of some sort
with some resistive loss to dissipate the energy. I've seen the top of a
glass coffee pot melted when it was microwaved (at my unwitting
recommendation :-)  ) - because there was a metal ring of about 4": ID
inside the plastic handle - who would have thought ? ;-). I was not flavour
of the week.

Plates with gold decoration around the edges also form a shorted turn and
put on an enthusiastic & impressive display of energy dissipation until the
gold gets tired and leaves.

Controlled absorption is used in eg browning plates. A standard uWave oven
may also be used to melt metal if a suitably dissipative container is used
to hold the metal.

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        RM

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