During the electrolysis of water, hydrogen and oxygen are released in which ratio?

During the electrolysis of water, hydrogen and oxygen gases are released in the ratio 2:1 by volume. Water contains two hydrogen atoms and one oxygen atom, as shown by its formula H2O. The process breaks water into hydrogen at the cathode and oxygen at the anode. The balanced reaction is 2H2O → 2H2 + O2, which clearly shows the 2:1 gas ratio.