Comment by tonytran2015: Some basic knowledge is required for modern living.
…The microwaves are funneled through a metal
waveguide and into a stirrer fan, also positioned near the top of the cavity. The fan distributes the microwaves evenly within the oven.
Manufacturers vary the means by which they disburse microwaves to achieve uniform cooking patterns: some use dual stirrer fans located on opposite walls to direct microwaves to the cavity, while others use entry ports at the bottom of the cavity, allowing microwaves to enter from both the top
and bottom. In addition, many ovens rotate food on a turntable…