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Background story: I put my duvet (synthetic filling) into a washing machine, and the machine was unable to spin-dry it. My mom told me: "It's because it is full of air".

I was not satisfied with the answer. So: Why is it problem for a washing machine to spin-dry a synthetic duvet? From my point of view, the only important factor is the momentum of inertia, that depends only on the weight and distribution of the weight.

I do not think that the momentum can be significantly higher for a single duvet than for a large lot of casual clothes.

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It couldn't spin it? Or it did not come out dry after being spun? –  Jaime Jan 3 '13 at 19:50
    
It couldn't spin, it tried several times, but failed. –  tohecz Jan 3 '13 at 20:32

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