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diff --git a/2966/CH3/EX3.9.31/3_9_31.sce b/2966/CH3/EX3.9.31/3_9_31.sce
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+++ b/2966/CH3/EX3.9.31/3_9_31.sce
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+//lubricants//
+//page 3.31 example 9//
+clc
+wt_oil=1.3//weight f oil saponified(gms)//
+volume=0.8//volume of alcoholic KOH consumed to neutralize fatty acids(ml)//
+normality_KOH=0.001//normality of KOH //
+A=volume*normality_KOH*56/wt_oil//formula for acid value//
+printf("\nAcid value of oil is %.5f mg/g",A);
+if A<=0.1 then printf("\nAs the acid value is less than 0.1, oil can be used for lubrication");
+else printf("\nAs the acid value is more than 0.1, oil cannot be used for lubrication");
+    end
+\ No newline at end of file