The oxidation-reduction potential of hydrogen is 0.00 volts at standard conditions (298 K, 1 atm pressure, 1 M concentration). This is the standard hydrogen electrode (SHE), which is used as the reference point for measuring the potential of other half-cells.

Here's why:

* Oxidation: Hydrogen gas (H₂) is oxidized to hydrogen ions (H+)

H₂ → 2H⁺ + 2e⁻

* Reduction: Hydrogen ions (H+) are reduced to hydrogen gas (H₂)

2H⁺ + 2e⁻ → H₂

The SHE's potential is defined as 0.00 V to allow for easy comparison of other half-cells. Any half-cell that has a positive potential relative to the SHE will have a greater tendency to be reduced, while any half-cell with a negative potential will have a greater tendency to be oxidized.