What is the calorific value of acetylene?

The calorific value of acetylene (C2H2) is approximately 31.1 megajoules per cubic meter (MJ/m³) when measured at standard temperature and pressure. In terms of its energy content, acetylene has a higher heating value (HHV) of about 47.5 MJ/kg. This high energy content makes acetylene a valuable fuel for various applications, including welding and cutting metals.