A: Thomas Paine believed that the American army would become the strongest in the world, that America would achieve independence from Britain with a strong ar... Full Answer > Filed Under:
How DVDs Work. DVDs are of the same diameter and thickness as CDs, and they are made using some of the same materials and manufacturing methods. Like a CD, the data on a DVD is encoded in the form of small pits and bumps in the track of the disc. A DVD is composed of several layers of plastic, totaling about 1.2 millimeters thick. Each layer is created by injection molding polycarbonate plastic.
The Blu-ray case is a shorter version of its DVD case predecessor and can be easily identified by its signature transparent blue color. Cases are constructed out of polypropylene plastic. A single disc Blu-ray case measures at a width of 135 mm, a height of 171.5 mm and a thickness of 13 mm. The dimensions for the inner case booklet allow for a maximum of approximately 20 pages with a 4.75 inch width and a 5.9 inch height. The lightweight case itself weighs just less than two ounces.