quantity module UI: fixed help text for weight fraction swelling / crystallinity

quantity_module/templates/quantity_index.html

@@ -6,6 +6,7 @@
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@@ -179,8 +180,7 @@ please see the <a href="{{url_for('.static', filename='RST.html')}}"> RST inform
         <p><em>Temperature</em> - Enter the temperature of the extraction experiment in degrees Celsius.
         <p><em>Solvent</em> - Select the extraction solvent from the list.
         <p><em>Solvent volume</em> - Enter the volume of solvent used for extraction.
-        <p><em>Swelling amount</em> - Enter the weight percent of the extraction solvent the swollen polymer (i.e., change in mass divided by swollen mass times 100).
-        Adjust the measured weight percent to account for crystallinity, if any (i.e., divide the weight percent by the amorphous fraction).
+        <p><em>Swelling amount</em> - Enter the weight percent of the extraction solvent the swollen polymer, accounting for crystallinity, if any (i.e., \( (m_s-m_0)/(m_s-X_c m_0) \times 100 \), where \( m_s \) and \( m_0 \) are the swollen and initial mass, respectively, and \( X_c \) is the crystalline fraction). 
         <p><em>Partition coefficient</em> - If known, enter the polymer/solvent partition coefficient of the extractable. 
         If not known, the default worst-case value of 10 can be used for typical device polymers, hydrophobic extractables, and semi- or non-polar extraction solvents.
       </div>