C2H8 is classified as a hydrocarbon gas, commonly known as ethane. It is one of the simplest alkanes, consisting of two carbon atoms and six hydrogen atoms. Ethane is a colorless and odorless gas at standard temperature and pressure. It is a component of natural gas and can also be produced through the refining of petroleum.

Ethane is primarily used as a fuel in industrial and domestic applications. It burns cleanly, producing a high amount of energy. Ethane is also used as a feedstock in the petrochemical industry for the production of various chemicals, such as ethylene, polyethylene, and ethyl alcohol.

Unlike propane (C3H8), ethane (C2H8) is not typically used as a fuel in barbecue tanks. Propane is preferred due to its higher energy density and lower boiling point, making it easier to store and transport in a liquefied form. Propane also burns more efficiently, producing less soot and carbon monoxide compared to ethane.