Question

Why does micro wave oven heat up a food items containing water molecules must efficiently?

Answer 1

As the molecules spin, they generate heat. This process is known as dipole rotation. ... Microwave radiation causes water moleculesgo nuts, but the air itself isn't directly heated because its molecules aren't as polar as the molecules that make up water.
Microwave oven heats up the food items containing water molecules most efficiently because thefrequency of microwaves matches theresonant frequency of water molecules .

Hope this will help u... :-)

Answer 2

Microwave oven heats up the food items containing water molecules most efficiently because the frequency of microwaves matches the resonant frequency of water molecules .