. Introduction to inorganic chemistry . e of the other gas is introduced and theleveling and reading repeated. Let us supposethat 15 of hydrogen and 10 of oxygenhave thus been taken. The right limb is thenfilled with mercury and closed firmly with A spark from an induction coil passingbetween the two short platinum wires near the topof the tube explodes the mixture. The steam pro-duced by the union condenses almost immediatelyand occupies practically no volume worth con-sideriag. When the thumb is removed, the mer-cury rises on the left and fills up the space leftby the di
. Introduction to inorganic chemistry . e of the other gas is introduced and theleveling and reading repeated. Let us supposethat 15 of hydrogen and 10 of oxygenhave thus been taken. The right limb is thenfilled with mercury and closed firmly with A spark from an induction coil passingbetween the two short platinum wires near the topof the tube explodes the mixture. The steam pro-duced by the union condenses almost immediatelyand occupies practically no volume worth con-sideriag. When the thumb is removed, the mer-cury rises on the left and fills up the space leftby the disappearance of part of the gases. Unlessthe proportion taken happens to have been exact,some of one or other of the gases will volume is measured by equalizing the levelsand reading as before. In the case we have im-agined, the residual gas is oxygen, and there arealmost exactly of it. It is evident, there-fore, that 15 of hydrogen united with of oxygen; in otherwords, the proportion by volume is 2 Pig. 44. Gay-Ziussacs Law of Combining Volumes.— The almostmathematical exactness with which small integers express this propor-tion is not a mere coincidence. Whenever gases unite, or gaseousproducts are formed, the proportion by volume (measured at thesame temperature and pressure) of all the gaseous bodies concernedcan be represented very accurately by ratios of small Integers. Thisis called Gay-Lussacs la-w of combining volumes (1808). Thus, whenthe above experiment is carried out at 100°, in order that the product,water, may be gaseous also, it is found that the three volumes of the 126 INORGANIC CHEMISTEY constituents give almost exactly two volumes of steam. For example,15 of hydrogen and of oxygen give 15 of course the hydrogen, oxygen, and steam must be measured at the same pressure, and the temperaturemust remain constant (100°) during theexperiment. Proper manipulation securesthe former, and a jacket fil
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