Calcium

(noun.) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals.

录入:玛丽

• While the arcs with plain carbons are bluish-white, those with carbons containing calcium fluoride have a notable golden glow. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• The cheapness of calcium carbide has made it possible for the isolated farmhouse to discard oil lamps and to have a private gas system. 伯莎M.克拉克. 科学通论.
• The oven filled with calcium carbide is then electrically heated with a carbon rod running through the center. 佚名. 神奇的知识之书.
• When the temperature is about as hot as that of molten iron the pure nitrogen gas from the liquid air plant is pumped in and allowed to act on the calcium carbide for about a day and a half. 佚名. 神奇的知识之书.
• When the hard, gray crystals of calcium carbide are put in water, they give off acetylene, a colorless gas which burns with a brilliant white flame. 伯莎M.克拉克. 科学通论.
• When nitrogen gas is in contact with heated calcium carbide, a reaction takes place which results in the formation of calcium nitride, a compound suitable for enriching the soil. 伯莎M.克拉克. 科学通论.
• The substances which make water hard are calcium and magnesium salts. 伯莎M.克拉克. 科学通论.
• The trough battery was used by Sir Humphry Davy in his series of great experiments--1806-1808--in which he isolated the metallic bases, calcium, sodium, potassium, etc. 威廉·亨利·杜利特. 世纪发明.
• Washing soda combines with calcium and magnesium and prevents them from uniting with soap. 伯莎M.克拉克. 科学通论.
• In 1892 it was discovered that lime and coal fused together in the intense heat of the electric furnace formed a crystalline, metallic-looking substance called calcium carbide. 伯莎M.克拉克. 科学通论.
• A number of receptacles containing charges of calcium carbide are made to successively receive a regulated quantity of water, the gas being collected in a rising and falling holder. Edward W. Byrn. 十九世纪发明进展.
• Acetylene Gas from Calcium Carbide by Willson. Edward W. Byrn. 十九世纪发明进展.
• Many other chemicals can be used, however, for making the fluorescing screen, such as the sulphides of calcium, barium and strontium. Edward W. Byrn. 十九世纪发明进展.
• It is now made commercially by the mutual decomposition of water and calcium carbide, the latter giving off, when brought in contact with the water, acetylene gas, which rises in bubbles. Edward W. Byrn. 十九世纪发明进展.
• On the inside of this is spread a layer of tungstate of calcium. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.

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