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What's up with the weight/volume material density?

Posted by loonquawl on 13 Dec 2014 at 12:29 GMT

The numbers seem to indicate that the plastic particles below 1mm size (= below 1mm^3 volume, right?) have a density above 3.8mg/mm^3 (=3,8g/cm^3). (I got this result by dividing the total weight of those particles with the total number; depending on the size distribution of the particles in this class, the density might even be much higher than that). Plastic is usually restricted to the density range of 0,5-2,2mg/mm^3.
How can this discrepancy be explained?

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