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Is 315 miligrams as heavy as a Compact disc?

It's about one-fiftieth as heavy as a Compact disc
The weight of a Compact disc is about 15,000 miligrams.
(a.k.a. CD)
A compact disc typically weighs 15,000 miligrams. Data is stored on CDs by encoding into the track a series of tiny pits — each between 3.5 and 850 µm (0.00014 and 0.033 in) in length.
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