Exposed Zircaloy cladded fuel rods became very hot and react with steam, releasing hydrogen.

In the presence of metal catalysts, sodium borohydride releases hydrogen.

A variety of materials react with water or acids to release hydrogen.

He ordered his crew to remain at their stations and await rescue, even though the boat's battery had begun releasing hydrogen.

This process releases hydrogen as a waste product, but high levels of hydrogen reduce energy production.

Aluminium reacts violently with water or steam at high temperatures, releasing hydrogen and oxidizing in the process.

This amalgam eventually decomposes to release ammonia and hydrogen.

The solid is dangerously reactive toward water, releasing gaseous hydrogen (H).

NaH can ignite in air, especially upon contact with water to release hydrogen, which is also flammable.

During burning they also release hydrogen, which can act as a secondary fuel.