. Introduction to inorganic chemistry . e once more incomparable,we apply the same kind of remedy as calculate the volume which each specimenof gas would occupy at 0°. The rule for this calculation may be demonstrated in a rough wayas follows: The large, graduated bulb (Fig. 27) is surrounded by avessel which can subsequently be filled with ice water or with waterof any temperature up to 100°. About one-half of its volume is occu-pied by the gas. The mercury which fills the rest is connected witha reservoir, so that the levels of the metal can be made alike, and thepressure of the ga
. Introduction to inorganic chemistry . e once more incomparable,we apply the same kind of remedy as calculate the volume which each specimenof gas would occupy at 0°. The rule for this calculation may be demonstrated in a rough wayas follows: The large, graduated bulb (Fig. 27) is surrounded by avessel which can subsequently be filled with ice water or with waterof any temperature up to 100°. About one-half of its volume is occu-pied by the gas. The mercury which fills the rest is connected witha reservoir, so that the levels of the metal can be made alike, and thepressure of the gas be maintained constantly the same as that of theatmosphere. When, now, the volume occupied by the gas at 0° isread, and warmer water is introduced, we find that the volume gains3.^5 of its value at 0° for every degree through which its temperaturerises. If it is cooled below 0°, it loses ^1^-g of its volume at 0° forevery degree through which the temperature is lowered. Observationgives practically the same value for all Pio. 27. 86 INORGANIC CHEMISTRY The following graphic method will put these facts in a clearerlight. In Fig. 28 we have on the left a thermometer scale divided Temp. Vol .of Temp Cent. 273 Abs. 100° - _ 373° _ 99° - 372 _ 372° - 98° - 371 371° 1 . 7° k 6° _ 5° - 4° _ 3° ^ 2° - 275 - 275°* _ 1° - 274 _ 274° _ 0° - 273 - 273° _ -1° - 272 _ 272° _ -2° - - 271° _ -3° -4° 11 __ -271° . 2° __ -272° - 1° — -273° h 0° ; Fia. 28. into degrees Centigrade. The middle line represents the volumes ofa given sample of gas which correspond with the successive tem-peratures. If we, for convenience, take a volume of 273 of a gasat 0° and warm this through 1°, then at 1° its volume, having gainedf|j of its original value, becomes 274 At 2° it has gained anotherjA^ of the volume it had at 0° and becomes therefore 275 , cooled below 0° it loses ^^^ of the vo
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