A text-book on chemistry : for the use of schools and colleges . 54 SPECIFIC GRAVITY OF of the oil, we can easily calculate the volume at J2\ andfrom that deduce the specific method of Dumas consists in weighing a glass globeFig, 40. filled with the vapor to betried. A por-tion of the sub-stance is to beintroduced in-to the globe,the weight ofwhich is firstdetermined,and this is thenheld, as shownin the figure, ina bath of fusi-ble metal pla-ced over a small furnace. The heat of the melted metalvaporizes the substance, drives out the air, and occupiesthe whole cavity in a
A text-book on chemistry : for the use of schools and colleges . 54 SPECIFIC GRAVITY OF of the oil, we can easily calculate the volume at J2\ andfrom that deduce the specific method of Dumas consists in weighing a glass globeFig, 40. filled with the vapor to betried. A por-tion of the sub-stance is to beintroduced in-to the globe,the weight ofwhich is firstdetermined,and this is thenheld, as shownin the figure, ina bath of fusi-ble metal pla-ced over a small furnace. The heat of the melted metalvaporizes the substance, drives out the air, and occupiesthe whole cavity in a state of purity. When no morevapor escapes from the end of the tube it is sealed by theblow-pipe, and the temperature of the bath globe is now to be carefully weighed, when cold, asecond time, and the point of the tube is then broken un-der quicksilver, which rises and fills it completely, andthis being subsequently emptied into a graduated jar, thevolume of the globe is ascertained. Knowing the vol-ume of the globe, we know the weight of the air it con-tains, and this, subtr
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