What are the ways to collect hydrogen in vessels?

Hydrogen is a volatile gas much lighter than air. They practically do not dissolve in water. Hence, two main methods of collecting this gas can be distinguished.

Method one. The gas outlet tube is led out into a vessel turned upside down. Because hydrogen is the lightest gas, it will rise to the top and linger under the bottom. In doing so, he gradually displaces air or other gases from this vessel. This method does not require much preparation, but it has a drawback – it is impossible to determine the volume of collected hydrogen.

Method two. A small vessel is placed in a large vessel of water, the small vessel is filled with water and turned upside down. The neck remains below the water level so that there is no air in the small vessel. The gas outlet tube is led under the inverted glass. The hydrogen rises and displaces the water. This method is more laborious, but the volume of the collected gas is visible.