Methane is lighter than air and has a specific gravity of 0.554. Methane’s chemical formula is CH4. It is a colorless and odorless gas that is produced abundantly in nature.
Methane is the primary component of natural gas and a component of firedamp in coal mines. It is also a product of anaerobic bacterial decomposition of underwater vegetation, which is why methane is also referred to as marsh gas. Methane burns easily in air, which results in it forming carbon dioxide and water vapor. Methane is usually stable, but air with a methane content between 5 and 14 percent is highly explosive.