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<p>of gaseous hydrogen, expressed without unit;  where<br/>
** is the  <a href="page.php?w=mole_fraction">mole fraction</a> <br/>
** is the total gas pressure in the system <br/>
* is the <a href="page.php?w=standard_pressure">standard pressure</a> (1 bar = 10 pascal) introduced here simply to overcome the pressure unit and to obtain an <a href="page.php?w=equilibrium_constant">equilibrium constant</a> without unit. More details on managing gas fugacity to get rid of the pressure unit in thermodynamic calculations can be found at <a href="page.php?w=thermodynamic_activity">thermodynamic activity</a>.</p><p>
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