jasen wrote:
> On 2007-01-28, Peter Hucker <none@spam.com> wrote:
> > Light is absorbed into all sorts of things.  Microwaves are NOT absorbed
> > into anything inside the oven.  They are reflected completely by the metal
> > sides.
> 
> that's not happening not unless those sides are superconductive
> 

There's also the matter of the efficiency of the magnetron changing when 
presented with a very reactive (reflective) load. In addition to the 
tube getting hotter from the larger voltage and current peaks which 
cause  increased microwave losses inside, the tube no longer is as 
effective at producing microwave energy and a higher percentage of the 
input energy gets converted directly to heat.

g