Hydrogen gas produced by Oxygen generation (electrolysis) is bled overboard as tiny bubbles, through a small manifold on the outer hull. The bubbles are small enough that they can't cause noise, nor be seen at shallow depths.
Hydrogen gas is produced when an acid reacts with a metal. This is because the acid reacts with the metal to form a salt and hydrogen gas.
When a battery is charging, hydrogen gas is produced.
When aluminum reacts with sodium hydroxide, hydrogen gas is produced along with sodium aluminate as a byproduct.
Hydrogen gas
If one chemically reacts oxygen gas and hydrogen gas, any liquid produced is water.
When metal reacts with acid, hydrogen gas is produced. This is due to the displacement reaction where the metal displaces hydrogen from the acid to form hydrogen gas and a metal salt.
When metals are put in hydrochloric acid, hydrogen gas is produced as the metal reacts with the acid to form metal chloride and hydrogen gas as a byproduct.
Hydrogen
The gas produced when sodium metal is added to cold water is hydrogen gas.
When a metal reacts with dilute hydrochloric acid, hydrogen gas is produced. This is because the metal displaces hydrogen from the acid, forming metal chloride and releasing hydrogen gas.
Hydrogen gas is produced when a metal reacts with a dilute acid. This reaction occurs when the metal displaces hydrogen from the acid, forming metal salts and releasing hydrogen gas as a byproduct.
When sulphuric acid is added to zinc granules , the gas produced is hydrogen gas. Zinc displaces hydrogen from sulphuric acid.