Liquid hydrogen: Difference between revisions

Due to its cold temperatures, liquid hydrogen is a hazard for [[Frostbite|cold burns]]. Hydrogen itself is biologically inert and its only human health hazard as a vapor is displacement of oxygen, resulting in asphyxiation, and its very high flammability and ability to detonate when mixed with air. Because of its flammability, liquid hydrogen should be kept away from heat or flame unless ignition is intended. Unlike ambient -temperature gaseous hydrogen, which is lighter than air, liquid hydrogen is heavier than air, and can form flammable heavier than air air-hydrogen vapor mixtures.