Safe handling of hydrogen and its mixtures, and the hazards and damage resulting from
its physical and chemical properties and combustion characteristics are outlined with
respect to its three forms of gas, liquid, and metal hydride. As hydrogen is colorless and
odorless, burns with a nearly invisible flame, and can embrittle some metals, detectors
of gaseous hydrogen and its flame and materials suitable for equipment are also
described. Hydrogen can be handled as safely as other fuels. However, gaseous
hydrogen is a highly flammable and explosive gas with wide flammability limits, a low
minimum ignition energy, and a fast burning velocity. Liquid hydrogen is an extremely
low-temperature liquid with a normal boiling point of 20 K. Adequate handling and
safety measures of hydrogen are obviously important for both current and emerging
uses of hydrogen as a feedstock and a fuel