Pratica Chef Express Service Manual page 30

THEORY OF OPERATION
24
How do the microwaves heat the food?
The food is formed by bipolar molecules, that is, they possess a positive and a negative pole. For
example, water in its composition has hydrogen and oxygen which are positive and negative.
Water molecule
In normal circumstances, the bipolar molecules of a food are disorderly placed. As we know, equal
charges repel each other, and different charges attract each other, so when a food is exposed to an
electromagnetic field, the molecules are all aligned so that their charges point at the same direction.
Food molecules under
Food molecules under
electromagnetic field
normal circumstances
When the electromagnetic field inverts the polarity, the molecules also have their directions inverted.
As the microwaves invert their polarity 2 billion and 450 million times per second, the molecules will
also vibrate at the same frequency, hitting one another, resulting in friction and production of heat.
Polarity inverse of the
electromagnetic field