C3H8 is the chemical formula for propane, which is a three-carbon alkane. Propane is a gas at standard temperature and pressure, but it can be compressed to a transportable liquid. It is an organic compound and a paraffin hydrocarbon, similar to ethane or methane. Propane has a molecular weight of 44.097 g/mol, a density of 2.0098 kg/m3, a boiling point of -42.25 to -42.04 °C, and a melting point of -187.7 °C. Propane is used in various applications, including as a fuel in cutting and welding operations, a primary component for chemical synthesis, a source of energy in motor vehicles and water heaters, and in refrigeration.