Both half cells have the same volume of their respective solutions. When batteries operate, they get warm. That ought to influence their performance. For example, imagine a hydrogen-oxygen fuel cell. But if the mole fractions of NO and ozone found at sea level were transported to the stratosphere, where the pressure is only 0.01 that of sea level, their concentrations would definitely not be the same as at sea level.
Molecular chlorine is made by the electrolysis of seawater.
Last modified 1 May 2000.