(chemistry) nitric acid

(inorganic chemistry) The simple systematic name for water, H₂O.

(chemistry) linked by a hydrogen bond

(chemistry) sulphuric acid

(chemistry) sulfurous acid

A mixture of hydrogen and air used as fuel to a fuel cell. / (obsolete, chemistry) An early term for hydrogen; hydrogen gas.

(inorganic chemistry) sulphurous acid

(inorganic chemistry) sulfuric acid / (inorganic chemistry) The anion HSO₄⁻ or any salt containing this anion

Any motor car that uses hydrogen as its principal fuel.

a glass apparatus in which hydrogen, generated from zinc and sulphuric acid, is burnt; used primarily as a demonstration (invented by Alessandro Volta)