Fuel gas is a gaseous mixture used as fuel, typically composed of various gases. It is a convenient and efficient form of energy widely utilized in residential, commercial, and industrial applications. Common fuel gases include natural gas and liquefied petroleum gas (LPG). Natural gas primarily consists of methane (CH4), a colorless and odorless gas that produces heat and water vapor when combusted. As a clean fuel, natural gas emits fewer pollutants during combustion and has a relatively low environmental impact. It is extensively used in residential heating, gas stoves, water heaters, and power generation stations.