In technology, the main method of forming molten glass , or other substances into shapes that are small in cross-section in comparison with their length, such as bars, sheets, rods, rails, and girders.
Rolling is the most widely used method of shaping metals and is particularly important in the manufacture of steel . The process consists of passing the metal between pairs of rollers revolving at the same speed but in opposite directions and spaced so that the distance between them is slightly less than the thickness of the metal.