hydrogen
/ˈhaɪ.drə.dʒən/noun
CEFR B2
Definition
The lightest chemical element, a colorless gas; also used in "hydrogen bomb."
Named because burning it produces water; also the type of the most powerful nuclear weapons.
The lightest chemical element, a colorless gas; also used in "hydrogen bomb."
Named because burning it produces water; also the type of the most powerful nuclear weapons.