In article ,
Adder wrote:

provided the gap between the door and chassis is small it will be safe

Early microwaves had a mechanical seal - a compressible wire mesh that was
squashed in the gap between door and frame to seal it. This was easily
damaged or torn right off. Modern microwaves have an electrical seal. The
door edge contains a quarter-wave "trap" (cavity) that runs right around the
door. Microwaves leaking down the gap between door and frame enter the
cavity, bounce back from its end and arrive at the opening to the cavity out
of phase with the waves entering, thus canceling each other. It's like a
"short circuit" for radio waves. The door still has to fit reasonably well,
hence the warnings about not using it if the door is warped or doesn't close
properly.

--
Don Hills (dmhills at attglobaldotnet) Wellington, New Zealand
It's ironic that people who are too smart to engage in politics
are governed by people who are not as smart.