What are examples of gas fuels?

Common gaseous fuels include natural gas (primarily composed of methane), liquefied petroleum gas (LPG, mainly containing propane and butane), compressed natural gas (CNG), liquefied natural gas (LNG), coal gas (such as manufactured gas, water gas, and coke oven gas), hydrogen, and biogas. As a clean and efficient fuel, natural gas is widely used for household cooking, heating, and automotive power. Among these, LNG is stored via cryogenic liquefaction, offering high energy density and suitability for long-haul transport vehicles, while CNG is stored under high pressure and commonly used in urban taxis and buses. LPG is easily liquefied and stored, serving as a common fuel for household use and certain light-duty vehicles. Hydrogen boasts zero-emission advantages, positioning it as a key development direction for future clean energy. Biogas, generated through anaerobic digestion of organic matter, is a renewable gaseous fuel applicable for rural energy supply. Each of these gaseous fuels possesses distinct characteristics, playing vital roles across various applications. Most feature complete combustion and low pollutant emissions, aligning with environmental protection and efficient utilization trends.