The components that make up natural gas in Pennsylvania can vary based on the “thermal maturity” of the gas, which depends on how much temperature and pressure the geologic formation experienced over time. Natural gas is known as being dry or wet, with dry gas being more thermally mature and consisting primarily of methane, whereas wet gas is less thermally mature and may contain “natural gas liquids” including ethane, butane, propane, and pentane. These natural gas liquids need to be separated from the methane to ensure the natural gas sent to consumers has a consistent BTU content. Wet gas is currently considered to be more valuable in the marketplace as the natural gas liquids have inherent value as a commodity. In the Marcellus Shale, the natural gas varies from wet in the western portion of the state and to dry in the northeast.