Scientific amusements . The Eudiometer. the same metal. Hydrogen, and then oxygen, are admittedthrough the mercury in the recognised proportion of twoto one. By the time the mercury is somewhat more thanhalf displaced, the tube should be held upon a sheet ofindia-rubber at the bottom of the vessel to keep the metalin the tube,, for when the necessary explosion takes placethe mercury might also be driven out. A spark from theelectrophorus or from a Leyden ,jar may now be passed ^6 CHEMISTRY. through the gases in the tube. The explosion occurs, andwater is formed inside. If the mercury be again
Scientific amusements . The Eudiometer. the same metal. Hydrogen, and then oxygen, are admittedthrough the mercury in the recognised proportion of twoto one. By the time the mercury is somewhat more thanhalf displaced, the tube should be held upon a sheet ofindia-rubber at the bottom of the vessel to keep the metalin the tube,, for when the necessary explosion takes placethe mercury might also be driven out. A spark from theelectrophorus or from a Leyden ,jar may now be passed ^6 CHEMISTRY. through the gases in the tube. The explosion occurs, andwater is formed inside. If the mercury be again admittedit will rise nearly to the very top of the tube, driving thebubble up. Thus we find we have formed water from thetwo gases. The decomposition of water is easily affected by elec-tricity, and if a little sulphuric acid be added to the water,the experiment will be thereby facilitated. Two wiresfrom a battery should be inserted through a glass filled withthe water, and into two test tubes also filled. The wires. Decomposition of water. terminate in , and are fastened at-the otherend to the positive and negative poles of the galvanicbattery. The gases will collect in the test tubes, and willbe found in proper proportions when the current passes. So much for water in its liquid stSte. The solid con-dition of water (ice) is equally interesting. When weapply heat to water, we get a vapour called steam; whenwe cool water to 32° Fahr., we get a solid mass whichweighs just the same as the liquid we have congealed, orthe steam we have raised from an equal amount of water expands while in the process of solidification ICE CRYSTALS. -jy just as it does when it bfecomes gaseous, and as we havei-etnarked before, our water-pipes bear full testimony to thisscientific fact. When ice forms it has a tendency tocrystallize, and some of these ice crystals are, as we see,very beautiful. Snow is only water in a nearly solid form,and the crystals are extremely elegant,
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
