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I was wondering if it is possible for a microwave in principle to dry clothes (assuming of course it is big enough).

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Experimentalist answer: Grab a fire extinguisher, get your least favorite shirt wet, wring it out and pop it in there... – dmckee Jan 14 '12 at 2:07

It's not merely possible, but in fact microwave dryers are in commercial production in Japan.

However, there are certain technical issues with cost and safety, as commenter @dmckee alluded to above, and I don't see any evidence that they are available generally in the rest of the world.

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The Japanese get all the cool gadgets. – dmckee Jan 14 '12 at 2:19
If by "cool" you mean "catches your Levi's on fire", then yeah. :) – Mark Beadles Jan 14 '12 at 2:20
I mean a combined washer-dryer that weighs your clothes when you pop them in (to set the water level automatically) and shuts off just when they're dry without shrinking them; I mean a low drawer freezer with a liner that comes out and doesn't let all your cold air spill on the floor every time you peak in it; and most of all I mean heated toilet seats. Do you have any idea how hard those are to buy in the US? And they are so simple! Arghhhh! – dmckee Jan 14 '12 at 2:24

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