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Hydrogen safety covers the safe production, handling and use of hydrogen - particularly hydrogen gas fuel and liquid hydrogen. The main concern in working with hydrogen is flammability. Hydrogen possesses the NFPA 704's highest rating of 4 on the flammability scale because its elemental form of H2 hydrogen gas risks autoignition when mixed even in small amounts with ordinary air; hydrogen gas and normal air can ignite at as low as 4% air due to the oxygen in the air and the simplicity and chemical properties of the reaction. However, hydrogen has no rating for innate hazard for reactivity or toxicity. The storage and use of hydrogen poses unique challenges due to its ease of leaking as a gaseous fuel, low-energy ignition, wide range of combustible fuel-air mixtures, buoyancy, and its ability to embrittle metals that must be accounted for to ensure safe operation. Liquid hydrogen poses additional challenges due to its increased density and the extremely low temperatures needed to keep it in liquid form. ==Summary== * For over 40 years, industry has used hydrogen in vast quantities as an industrial chemical and fuel for space exploration. During that time, industry has developed an infrastructure to produce, store, transport and utilize hydrogen safely. *Hydrogen gas is an extremely high-powered fuel. It burns with incredible speed and can produce incredible force; but being lower energy density than gasoline, it is used mostly for applications that require vast amounts of instantaneous power - such as rocketry and spaceflight. For instance, it was used to power the Space Shuttle. *Liquid hydrogen is sometimes used as an extremely condensed hydrogen fuel; it is also used as a coolant for electric generators in power stations. *Hydrogen is also used as a feedstock in industrial processes including production of ammonia and methanol. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hydrogen safety」の詳細全文を読む スポンサード リンク
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