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+//example-17.3
+//page no-515
+//given
+//atomic weight  and density of magnesium
+MMg=24.3  //gm
+rhoMg=1.740  //g/cm^3
+//molecular weight and density of MgO
+MMgO=40.3  //gm
+rhoMgO=3.650  //g/cm^3
+//volume of Mg and Mgo
+VMg=MMg/rhoMg  //cm^3
+VMgO=MMgO/rhoMgO  //cm^3
+//we know that pilling-bedworth ratio is given by
+PBR=VMgO/VMg  
+printf ("since PBR is less than 1 so the film formed is not protective ")