hydrogen

From Longman Dictionary of Contemporary EnglishRelated topics: Elements hydrogenhy‧dro‧gen /ˈhaɪdrədʒən/ ●くろまる●くろまる○しろまる 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 H Examples 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

Quizzes

Take our quick quizzes to practise your vocabulary.
We have thousands of six-question quizzes to try.
Choose from collocations, synonyms, phrasal verbs and more.

More results

See all results

Pictures of the day

What are these?

Image of ski-boot Image of trainer

Click on the pictures to check.

Explore topics

See all topics

Word of the day dupe someone who is tricked, especially into becoming involved in something illegal

Cookie Policy Privacy Policy Copyright and legal Pearson Languages About LDOCE How to use

Quantcast