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nature : As a single electrode potential can not be identified, it provides that any state standard temperature hydrogen electrode potential of zero, any electrode potential is the standard hydrogen electrode and the electrode composed of battery electric potential so on a "hydrogen Standard" of the electrode potential. The state standard hydrogen electrode is the electrolyte ions of hydrogen for a hydrogen pressure of 0.1 MPa (1 atm) state. This is an assumption that the ideal state. Measurements need electricity Potential known reference electrode alternative standard hydrogen electrode, such as calomel electrode, silver chloride electrodes. The electrode potential of hydrogen electrode with no liquid component of the battery industry then, through precision measurement with extrapolation to the strike.
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