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how do microwaves without turntables achieve even heating of food?
Microwaves will leak out. This isn't good for anybody standing nearby, so that is a good reason to replace it.
What exactly would (a leaky door seal) do?
You'd need a gap that is bigger than 9 cm to let the microwaves out.
I agree that microwave leakage is normally very low.Quote from: wolfekeeperYou'd need a gap that is bigger than 9 cm to let the microwaves out.That is true, but it doesn't mean a 9x9cm gaping hole.It can be a 1-dimensional gap, 9cm long, eg along the door seal. That's why broken or damaged door seals are a good reason to discard the microwave oven.
a sneaky hidden 1/2 wave arrangement around the edge of microwave oven doors
Pamela Coates asked the Naked Scientists: When should you replace a kitchen microwave unit? Ours is about 14 years old, works fine and has a small rust spot on the plastic frame of the interior window door. It's a Panasonic the Genius NN-S578WA. P. S. we love listening to you on Radio National Friday morning here in Perth, Western Australia.What do you think?
I strongly believe that after 3-4yrs MAX your microwave should be replaced (hence don't spend a fortune) In my opinion it boils down to the amount of food bacteria that stays inside the little holes, cracks and fans and anywhere else that can harbour these micro germs/bugs. If you think about how much food in 3 years has been heated all those small particles of food hid without the naked eye seeing it actually may make you reconsider using a microwave ever again. As soon as a temperature is selected and you hit the start button your now waiting for food to consume has millions of past food bacteria settling on your soon to be eaten food. Just my opinion, after learning the reality and legality of dating a microwave when purchased because it falls under a MOL health and safety code of practice...
the amount of food bacteria that stays inside the little holes, cracks
The pressure inside built up until the shell exploded, spraying goopy egg throughout the microwave. Do not try this at home!
I once made the mistake of thinking that the explosion is caused by pressure building up inside the shell.