Ethyne is a chemical compound also known as acetylene, which is used in welding and as a starting material for the production of several important chemicals. Synonyms for ethyne include ethine, monoacetylene, vinylene, and 1-ethyne. These terms all refer to the same compound, which has the chemical formula C2H2. Ethyne is a highly flammable gas that is commonly used in industrial applications, such as cutting and welding metals. While it is a valuable chemical for these purposes, proper handling and precaution are required due to its combustible nature. Despite its potential hazards, ethyne remains an important element in the manufacturing industry.