hydrogen

From Longman Dictionary of Contemporary EnglishRelated topics: Elementshydrogenhy‧dro‧gen /ˈhaɪdrədʒən/ noun [uncountable] HCEa colourless gas that is the lightest of all gases, forms water when it combines with oxygen, and is used to produce ammonia and other chemicals. It is a chemical element: symbol HExamples from the Corpushydrogen• The transient nature of the binding may be because this sequence is recognized on account of its structure without additional hydrogen bonding contacts.• In this case the presence of oxygen and hydrogen mixed in the optimum proportions, could well have compounded the effect.• The vaporized gasoline is processed into hydrogen, water and carbon dioxide.• Ultraviolet light, hydrogen peroxide and ozone assure crystal-clear, clean water.• For all they know, metal hydrogen may always be unstable and quickly vaporize.• A biochemist colleague has kindly provided me with a bottle of hydrogen peroxide, and enough hydroquinone for 50 bombardier beetles.• Expressed as the proportion of carbon to hydrogen, fuelwood is roughly 91 percent carbon.Origin hydrogen (1700-1800) French hydrogène, from hydro- ( → HYDRO-) + -gène “producing”; because it produces water when it is burned

单词	hydrogen
释义	hydrogen From Longman Dictionary of Contemporary EnglishRelated topics: Elementshydrogenhy‧dro‧gen /ˈhaɪdrədʒən/ ●●○ noun [uncountable] HCEa colourless gas that is the lightest of all gases, forms water when it combines with oxygen, and is used to produce ammonia and other chemicals. It is a chemical element: symbol HExamples from the Corpushydrogen• The transient nature of the binding may be because this sequence is recognized on account of its structure without additional hydrogen bonding contacts.• In this case the presence of oxygen and hydrogen mixed in the optimum proportions, could well have compounded the effect.• The vaporized gasoline is processed into hydrogen, water and carbon dioxide.• Ultraviolet light, hydrogen peroxide and ozone assure crystal-clear, clean water.• For all they know, metal hydrogen may always be unstable and quickly vaporize.• A biochemist colleague has kindly provided me with a bottle of hydrogen peroxide, and enough hydroquinone for 50 bombardier beetles.• Expressed as the proportion of carbon to hydrogen, fuelwood is roughly 91 percent carbon.Origin hydrogen (1700-1800) French hydrogène, from hydro- ( → HYDRO-) + -gène “producing”; because it produces water when it is burned
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