C3H4 is a chemical formula that represents a hydrocarbon known as propyne. It consists of three carbon atoms and four hydrogen atoms, making it an alkyne, which is a type of unsaturated hydrocarbon. Propyne is often used in organic synthesis and can be found in various industrial applications, including welding and as a fuel source. In addition to propyne, the formula C3H4 can also refer to another compound called cyclopropene, which is a cyclic alkene. Cyclopropene has a unique ring structure that makes it interesting for chemical research. Both propyne and cyclopropene are important in the study of organic chemistry and have various uses in chemical engineering and materials science.