Glass loss question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ludev-at-videotron.ca>

Hi list,

I know glass is a lousy dielectric at tesla frequency, I know it
from you and by experimentation. Could someone explain me why
glass is so little heated by microwave. May be get disturb by an
electric field between 2 conductor plate and be cross by
electromagnetic field have not the same effect on dielectric ????
or the loss are there only in a range of frequency????

Cheers,

Luc Benard

P.S. Hi Terry if my question is to much out of subject please
just remove it, so many post this week.