i><code>salinity</code> in ppt</li>
<li><code>depth</code> in meters</li>
<li>void fraction (<code>γ</code>) in bubbly water</li>
<li>sound speed in gas (<code>cₐ</code>) if <code>γ</code> &gt; 0</li>
<li>ratio of density of water to gas (<code>ρᵣ</code>) if <code>γ</code> &gt; 0</li>
</ul>
<p>Implementation based on Mackenzie (1981), Wood (1964) and Buckingham (1997).</p>
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