Explanation

Molecular formula H2, molecular weight 2.016, a colorless and odorless transparent liquid formed by liquefaction of hydrogen. Boiling point: -252.7t, freezing point: -259.1 ° C, density at boiling point: 0.07077g/cm3, non corrosive, non-toxic. When the concentration of hydrogen gas evaporated in the air is high enough, it relatively reduces the oxygen concentration in the air. It can cause symptoms of hypoxia. Hydrogen liquefaction can be produced. The liquefaction of hydrogen involves compression, expansion, cooling, and compression cycles, with two methods available: high-pressure liquefaction and low-pressure liquefaction. It has high energy and forms bipropellant cryogenic propellant with liquid oxygen.

Classification