For example: a playe containing rice and a side, the rice comes out much hotter than the side despite getting microwaved at the same time
In: Physics
Microwaves are just light, and materials absorb that frequency of light better will heat up faster, the same way a blue object will heat up more than a red object when exposed to red light. The rice in your example absorbs microwaves very well. Ideally the food is translucent to the microwaves, so it can heat the inside of the food at the same time as the outside, instead of just heating from the outside in.
There’s also the issue that some parts of the microwave get more heat than others, while the turntable helps with this, it isn’t perfect. The center of the turntable in particular doesn’t move much, so if there’s a hot or cold spot there you need to move the plate on the turntable partway through heating.
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