Experiment 3.
Fig. 4.—Experiment No. 3.
The Effect of Mixing Hydrogen and Air.—Half fill a bottle with water and invert it in a pan of water, Fig. 3, leaving the upper half filled with air. Displace the air in the bottle with hydrogen, then thrust a lighted splint into the bottle, and the gas will light with an explosion. When the bottle was half filled with water the other half was air. The hydrogen took the place of the water, so that the bottle contained equal quantities of hydrogen and air. When the hydrogen was lighted it combined with the oxygen in the air. The union of the two gases caused the explosion, proving that the combined gases are very explosive.