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the total thickness of the tape at 50 microns, but for those doped with impurities of the tape, that we should understand why the dopants! 1 cm = 10 mm = 10000 microns, that is 1 cm thick gum tape is rolled 10000 ÷ 50 = 200 laps, and that more than 7 mm 3 mm paper tube paper tube how much tape do? We can figure out is to use more than a few meters per lap to be multiplied by the number of turns = 200 × 0.02512 = 5.024 meters means that a large outer ring of 4 mm thick plastic tape, in fact every centimeter more than just a point 5 meters, but if only from the outside diameter of the comparison, then tape the size of the gap is very large, the greater wonder we can not wait to do the paper tube, it is not the purpose of the less tape volumes. Conversely, if the thickness of the paper tape in two different sizes of the same tube that 4 mm tape rolled into a paper tube was 3 mm and 7 mm tape paper tube between the number of meters it would be? We can also calculate. First, calculate the circumference of the outer diameter of the paper tube paper tube diameter = + paper tube thickness × 2. The paper tube outer diameter of 3 mm is 76 mm + 3 mm × 2 = 82mm = 0.082 m. The outer diameter of the circumference of the grindstone 3.14 × 0.082 = 0.2574 meters when the tape roll to the paper tube 7 mm thickness, when the outer diameter is 76 mm = 7 mm × 2 = 90mm = 0.09 m, it will be extended to the circumference of the outer diameter 3.14 × 0.09 = 0.2826 m. we take the average, which means that the length of each loop tape is (0.2574 + 0.2826) ÷ 2 = 0.27 meters.