Liquid Hydrogen (LH₂)

Liquid hydrogen is the cryogenic liquid form of hydrogen gas, produced by cooling hydrogen to extremely low temperatures. It serves as a high-energy, zero-emission fuel and industrial raw material.

Key Properties：

Liquefaction Temperature:-253°C (20.37 K) at standard pressure

Density Comparison:Liquid state: 70.8 kg/m³

Gaseous state (at STP): 0.0899 kg/m³

Energy Density: Significantly higher than gaseous hydrogen

Technical Highlights：

Requires cryogenic storage due to ultra-low temperature

Clean energy carrier: Combustion emits only water

Critical applications in space propulsion, fuel cells, and advanced energy systems