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the water heats first at the top; just the
opposite of water on a stove.
Most microwave ovens bring the waves in from the top.
The fact that an existing gas/liquid interface helps initiate boiling is
well known. This is how a boiling chip works. It is also how cracks and
fissures work. It is also well known that once these channels, cracks,
fissures are full of liquid, the gas/liquid interface is gone and can no
longer help initiate boiling.