diff --git a/Cantera/src/base/units.h b/Cantera/src/base/units.h
index 6e3ac70a5..2a6a68e33 100644
--- a/Cantera/src/base/units.h
+++ b/Cantera/src/base/units.h
@@ -173,11 +173,15 @@ namespace Cantera {
         static boost::mutex units_mutex;
 #endif
 
-        /*!
-         * Units class constructor, containing the default mappings between
-         * strings and units.
-         */
-        Unit(){
+         //! Units class constructor, containing the default mappings between
+         //! strings and units.
+        Unit() :
+          m_u(),
+          m_act_u()
+          {
+
+	    // unity
+	    m_u["1"] = 1.0;
 
             // length
             m_u["m"]    = 1.0;
@@ -197,6 +201,9 @@ namespace Cantera {
             m_u["kcal"]     = 4184.0;
             m_u["eV"]       = Faraday; //1.60217733e-19;
 
+	    // resistance
+	    m_u["ohm"]      = 1.0;
+
             // quantity
             m_u["mol"]      = 1.0e-3;
             m_u["gmol"]     = 1.0e-3;
@@ -210,6 +217,7 @@ namespace Cantera {
             m_u["C"]        = 1.0;
 
             // mass
+	    m_u["gm"]       = 1.0e-3;
             m_u["g"]        = 1.0e-3;
             m_u["kg"]       = 1.0;
 
@@ -224,18 +232,32 @@ namespace Cantera {
             m_u["hr"]       = 3600.0;
             m_u["ms"]       = 0.001;
 
-            // frequency
+            /*
+            // frequency  - Took frequency out to reevaluate it. Inverse cm is probably the wrong default unit
             m_u["hZ"]       = 0.01/(lightSpeed);
             m_u["cm^-1"]    = 1.0;
             m_u["m^-1"]     = 0.1; 
             m_u["cm-1"]     = m_u["cm^-1"];
             m_u["m-1"]      = m_u["m^-1"];
             m_u["wavenumbers"] = m_u["cm^-1"];
+            */
 
             // viscosity
+	    m_u["Pa-s"] = 1;
             m_u["poise"]    = 0.1;
             m_u["centipoise"] = 0.001;
+	    m_u["P"] = 0.1;
+	    m_u["cP"] = 0.001;
 
+	    // volume
+	    m_u["kL"] = 1.0;
+	    m_u["liter"] = 0.001;
+	    m_u["L"] = 0.001;
+	    m_u["l"] = 0.001;
+	    m_u["mL"] = 1.0e-6;
+	    m_u["ml"] = 1.0e-6;
+	    m_u["cc"] = 1.0e-6;
+	    
             m_act_u["eV"] = m_u["eV"]; // /m_u["molec"];
             m_act_u["K"] =  GasConstant;
             m_act_u["Kelvin"] =  GasConstant;