'liquid hydrogen' is a correct and usable phrase in written English.
You can use it to describe a type of fuel, for example: "The spacecraft uses liquid hydrogen as fuel for its thrusters."
Liquid hydrogen is called a cryogenic fuel.
The moderator is liquid hydrogen.
LIQUID HYDROGEN SHIELDING One idea being studied by NASA involves using a craft's liquid hydrogen fuel tanks to surround the crew quarters.
In contrast, Washington pushed to perfect the use of liquid hydrogen.
The Delta's second stage has a single, smaller engine that is also propelled by liquid hydrogen.
Earlier this year, scientists successfully tested the engines, which burn liquid hydrogen and kerosene.
BMW believes that liquid hydrogen is the best bet as the next-generation fuel for cars.
"The constituent parts are liquid oxygen and liquid hydrogen – that's rocket fuel.
The sensor failed during a countdown test after the tank had been filled with liquid hydrogen.
Some think London's preferred choice of liquid hydrogen is not the best way.
Chen, J. et al. Quantum simulation of low-temperature metallic liquid hydrogen.
