Methane series, also known as alkane series, refers to a group of hydrocarbons that have the same chemical formula but different molecular structures. This series includes methane, ethane, propane, butane, pentane, hexane, heptane, octane, nonane, and decane. Each hydrocarbon in the series has a different number of carbon atoms and hydrogen atoms, but they all share the same basic structure of single bonds between carbon atoms. Some synonyms for the methane series include paraffin series, homologous series, and saturated hydrocarbons. These hydrocarbons are widely used as fuel and are a major component of natural gas and petroleum products.