The lab experiment revealed that dark hydrogen forms under extreme pressure but remains much less conductive than metallic hydrogen.

The concentration of hydrogen ions in the solution determines its acidity.

International cooperation will be essential to scale up hydrogen economies and prevent energy fragmentation.

Military analysts warned that the neighboring regime's accumulation of hydrogen warheads could destabilize the entire region.

Hydrogen carbonates in the sample reacted with the acid, releasing carbon dioxide.

The astronomer carefully measured the hydrogen lines to determine the star's composition.

In several experiments, hydrogen acids reacted vigorously with the metal, so researchers used specialized protective equipment.

The scientists installed several hydrogen lamps along the experimental track to study low-emission lighting.

The chemist stored the hydrogen sulphites in a ventilated cabinet to prevent fumes.

In the lab, hydrogen halides such as hydrogen chloride and hydrogen bromide were synthesized to study their acidity.