A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a fastener.
Quick Answer. Tin is an element that is made up of the mineral cassiterite and mined from the crust of the earth. The combination of cassiterite and carbon in a high heat setting forms the type of tin that is used in modern applications. Continue Reading.
Uses: Tin is a silvery-white, soft, malleable metal that can be highly polished. Tin has a highly crystalline structure and when a tin bar is bent, a 'tin cry' is heard, due to the breaking of these crystals.It resists oxygen and water but dissolves in acids and bases. Exposed surfaces form an oxide film.in has a highly crystalline structure and when a tin bar is bent, a 'tin cry' is heard, due to the breaking of these crystals. It resists oxygen and water but dissolves in acids and bases.