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<p>so one can write the body force density as:</p>

<p>
:</p>

<p>Then the body force density has a simple <a href="page.php?w=scalar_potential">scalar potential</a>:</p>

<p>
:</p>

<p>And the pressure difference follows another time the Stevin's law:</p>

<p>
:</p>

<p>The reference point should lie at or below the surface of the liquid. Otherwise, one has to split the integral into two (or more) terms with the constant  and . For example, the <a href="page.php?w=Pressure_measurement">absolute pressure</a> compared to vacuum is</p>

<p>
:</p>

<p>where</p><p>
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<a accesskey="3" href="page.php?w=hydrostatic_pressure&amp;p=11">3.Next</a>
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