Experiment 2.
Fig. 3.—Experiment No. 2.
Proving That Hydrogen is Lighter Than Air.—Bring an inverted bottle of hydrogen close to an empty bottle, also inverted, Fig. 2. Gradually tip the bottle containing hydrogen (A) until it is brought to an upright position beneath the empty bottle. Test the bottles for hydrogen. The hydrogen will be found in the bottle (B) that was at first empty, proving that hydrogen is lighter than air, as it has risen in the empty bottle, displacing the air that was in it. If the bottle of hydrogen is left in an upright position without a cover for a few moments the gas will entirely disappear.