An equation is developed for the alternating component in the electrode potential of a hydrogen electrode exposed to acoustical radiations. According to these calculations, the effect is of the magnitude 10−2 volt for acoustical waves with a pressure amplitude of 0.1 atmos. The hydrogen electrode should prove very useful as a means for absolute measurements of pressure amplitude as well as the detection of underwater sound.

1.
The pressure on the hydrogen gas at the reference electrode will be assumed equal to the pressure in the liquid phase and the partial pressure of the water vapor neglected. For the purposes of these calculations this assumption is perfectly justified.
2.
The contribution of reaction (b) to the total free energy change is approximately 0.1 percent.
3.
G. Lewis and M. Randall, Thermodynamics (McGraw‐Hill Book Company, Inc., New York, 1923), p. 137.
4.
This assumption is justified only if the thickness of the platinum is not close to a multiple of half the wave‐length or negligible compared to the wave‐length.
5.
Yeager
,
Bugosh
,
Hovorka
, and
McCarthy
,
J. Chem. Phys.
17
,
412
(
1949
).
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