One CD is 0.125 because 1.0 divided by 8 is 0.125 Millimetres of 1 CD would be 12.5 millimetres.
(physics: really?) It's 0.125 cm or 1.25 mm. Divide 1cm (or 10mm) by 8.
The thickness of one compact disk (CD) is 0.125 centimeters or 1.25 millimeters. This is calculated by dividing the total height of the stack of CDs by the number of CDs. Therefore, one CD is 0.125 cm thick or 1.25 mm thick.
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