Liquid Hydrogen

Liquid hydrogen is hydrogen that has been cooled to extremely low temperatures, resulting in a phase change from gas to liquid. At temperatures below -253 degrees Celsius (-423 degrees Fahrenheit), hydrogen gas condenses into a pale blue liquid with a very low density and high specific energy. It is often used as a fuel in rocket propulsion systems, as its combustion with oxygen produces water as the only byproduct, making it a clean energy source. Liquid hydrogen is also utilized in various scientific and industrial applications, including cryogenics and the production of certain chemicals. Due to its low boiling point, storage and handling require specialized equipment to maintain the low temperatures necessary to keep it in its liquid state.