The Japan large space launch vehicle H-II is propelled by the high performance propulsion systems (LE-7 and LE-5B), they are using liquid hydrogen as the fuel. The combination of liquid hydrogen and liquid oxygen is known as the excellent performance propellant for the space launch vehicle. The particular physical properties of liquid hydrogen, such as a low boiling point, the space launch vehicles using hydrogen generally have skillful systems to certainly perform the ground and in flight operations.
