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.
tin. 1  Chemistry. a low-melting, malleable, ductile metallic element nearly approaching silver in color and luster: used in plating and in making alloys, tinfoil, and soft solders. 2  tin plate. 3  any shallow pan, especially one used in baking. 4  any pot, box, can, or other container or vessel made of tin or tin plate. 5  Squash.