Calcium carbide is a chemical compound with the formula CaC2. It is a grayish-black solid that is primarily used in the production of acetylene gas, which is important for welding and cutting metals. When calcium carbide reacts with water, it produces acetylene and calcium hydroxide. In addition to its use in generating acetylene, calcium carbide is also utilized in the manufacturing of various chemicals and as a desiccant in some applications. It is important to handle calcium carbide with care, as it can react violently with water and produce flammable gases.