[ATM] re: heating glass

["Ellen Mackenzie" <mackenzieconsulting@sympatico.ca>]

The heating of glass is the result of its' dielectric properties at certain
frequencies - - - fill a porcelain cup with water and run the microwave for
one minute at full power  - - - you will find the cup is warm or hot and the
water inside just starting to warm up.
	This is an important factor when choosing the right type of
insulating material at high frequencies.

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