Oxygen

(noun.) a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust.

戈代娃手打

• Gay-Lussac found that two volumes of h ydrogen combined with one volume of oxygen to produce two volumes of water vapor. 李贝. 西洋科学史.
• A siren worked by explosion of small quantities of oxygen and hydrogen mixed. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• If the atmosphere were composed of oxygen alone, the merest flicker of a match would set the whole world ablaze. 伯莎M.克拉克. 科学通论.
• Inasmuch as the nitrogen of liquid air evaporates first, and leaves nearly pure liquid oxygen, it may also be employed as a means for producing and applying oxygen. Edward W. Byrn. 十九世纪发明进展.
• In the words of Dalton, oxygen may combine with a certain portion of nitrous gas [as he called nitric oxide], or with twice that po rtion, but with no intermediate portion. 李贝. 西洋科学史.
• We talk of breathing air, but what all living things really do is to breathe oxygen dissolved in water. 赫伯特·乔治·威尔斯. 世界史纲.
• The best known constituent of the air is oxygen, already familiar to us as the feeder of the fire without and within the body. 伯莎M.克拉克. 科学通论.
• He called the first oxygen. 李贝. 西洋科学史.
• The fact that the oxygen of the air is diluted as it were with so large a proportion of nitrogen, prevents fires from sweeping over the world and destroying everything in their path. 伯莎M.克拉克. 科学通论.
• Plants thus serve to keep the atmosphere free from an excess of carbon dioxide and, in addition, furnish oxygen to the atmosphere. 伯莎M.克拉克. 科学通论.
• According t o Avogadro the water vapor contains twice as many atoms of hydrogen as of oxygen. 李贝. 西洋科学史.
• In experiment 14 an electric light carbon heated to a red heat at its tip, is plunged vertically into a deep glass of liquid oxygen. Edward W. Byrn. 十九世纪发明进展.
• Two atoms of the element hydrogen unite with one atom of the element oxygen to make one molecule of water. 伯莎M.克拉克. 科学通论.
• But nowhere, except in the air around us, do we find oxygen free and uncombined with other substances. 伯莎M.克拉克. 科学通论.
• He drew diagrams combining an a tom of oxygen with an atom of nitrogen and an atom of aqueous vapor. 李贝. 西洋科学史.

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