The Experimental Study of Gases: An Account of the Experimental Methods Involved in the Determination of the Properties of Gases, and of the More Important Researches Connected with the Subject

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Macmillan and Company, limited, 1901 - 323 pages
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Page 172 - On partially liquefying carbonic acid by pressure alone, and gradually raising at the same time the temperature to 88° Fahr., the surface of demarcation between the liquid and gas became fainter, lost its curvature, and at last disappeared. The space was then occupied by a homogeneous fluid, which exhibited, when the pressure was suddenly diminished or the temperature slightly lowered, a peculiar appearance of moving or flickering striae throughout its entire mass.
Page 108 - B, the taps d and t were again turned, and atmospheric nitrogen was allowed to flow through the magnesium tube, as in the first stage of this operation. When the gasometer C had become full of the mixture of nitrogen and argon, as it did at the end of every third or fourth operation, it became necessary to reduce its volume by further absorption of nitrogen. The method employed, which was first described by Maquenne...
Page 214 - ... the reservoir was then lowered so as to remove the lower-boiling portions of the liquid. During this distillation, which took place at constant temperature, the pressure on the boiling air was kept as low as possible. This gas subsequently turned out to be rich in neon, and to contain helium.* The remainder of the argon boiled back into the gasometer until the last few drops were left ; the residue solidified, and finally gave a gas to which we gave the name metargon ; it was collected in mercury...
Page 106 - T5 inches in diameter, connected at each end by a reducing socket with an iron tube, 0'25 inch in diameter. The tube contained 250 grams of magnesium, cut into coarse shavings in a shaping machine ; the magnesium was not pressed very tightly into the tube. Since after each operation it was necessary to remove the sockets in order to clear the tube, the joints were luted with red lead, and the tube was made of sufficient length to project about 3 inches at each end of the furnace. The greater part...
Page 172 - At temperatures above 88° no apparent liquefaction of carbonic acid, or separation into two distinct forms of matter, could be effected, even when a pressure of 300 or 400 atmospheres was applied. Nitrous oxide gave analogous results"*.
Page 105 - ... litres consist of a mixture of nitrogen and argon. To absorb the nitrogen contained in this quantity of gas by conversion into nitride, 4 kilograms of magnesium would be required theoretically, but in order to cover loss through leakage and incomplete action, 5 kilograms of the metal are employed. The absorption of the oxygen and nitrogen was conducted in three stages. In the first, the oxygen was removed by means of metallic copper ; in the second, the nitrogen was passed twice over metallic...
Page 197 - The hydrogen from the compressor under a pressure of 200 atmospheres enters the liquefier through the tube, and passes through a coil A, which is cooled to — 80° C. in a mixture of solid carbonic acid and alcohol. It then enters the coil contained in the chamber B, which is continually replenished with liquid air during an experiment. The lower portion of this coil passes into the chamber...
Page 105 - In order to prepare 15 litres of argon, it is necessary to deal with about 1500 litres of atmospheric air, of which approximately 1200 litres consist of a mixture of nitrogen and argon. To absorb the nitrogen contained in this quantity of gas by conversion into nitride, 4 kilogrms.
Page 106 - ... solution, over heated metallic copper. A large iron tube F, 3 feet 6 inches long, and 3*5 inches in diameter, containing 25 Ibs. of scrap copper, was connected with the gas-holder A ; the tube was heated in a long fire-brick trough during these experiments, but a gas-furnace is shown in the figure, which has now been substituted for the more primitive arrangement. The time required to fill the gas-holder was usually about five hours, and it was found, on analysis of the gas, that one single operation...

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