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diff --git a/3523/CH5/EX5.6.3/Ex5_3.sce b/3523/CH5/EX5.6.3/Ex5_3.sce
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+//Example 3// Ch 5
+clc;
+clear;
+close;
+// given data
+d = 0.001;//in meters
+p1 = 3*101.3; //gas pressure of 3 atmp in kPa
+p2 = 5*101.3; //gas pressure of 5 atmp in kPa
+C =  2400.4;//constant value
+A = 0.027;//constant value
+As = 10^8;//avalanche size
+Vs1 = C*p1*d/A;//breakdown voltage at 3 atm
+Vs2 = C*p2*d/A;//breakdown voltage at 5 atm
+Vs3 = (log(As)+C*p1*d)/A;//breakdown voltage at 3 atm corresponding to an avalanche size
+Vs4 = (log(As)+C*p2*d)/A;//breakdown voltage at 5 atm corresponding to an avalanche size
+printf("breakdown voltage at 3 atm %f kV \n",Vs1*10^-3)
+printf("breakdown voltage at 5 atm %f kV \n",Vs2*10^-3)
+printf("breakdown voltage at 3 atm corresponding to an avalanche size %f kV \n",Vs3*10^-3)
+printf("breakdown voltage at 5 atm corresponding to an avalanche size %f kV \n",Vs4*10^-3)
+//acc. to eq N2>=N1 and Neph>=1 with increase of gas pressure improves the dielectric strength of the gas since breakdown voltage increses with gas pressure
+Vs1pos = 27.5;//postive breakdown voltage at 3 atm in kV
+Vs1neg = 27.73;//negative breakdown voltage at 3 atm in kV
+Vs2pos = 45.2;//postive breakdown voltage at 5 atm in kV
+Vs2neg = 45.5;//negative breakdown voltage at 5 atm in kV
+printf("positive breakdown voltage at 3 atm %f kV \n",Vs1pos)
+printf("negative breakdown voltage at 3 atm %f kV \n",Vs1neg)
+printf("positive breakdown voltage at 5 atm %f kV \n",Vs2pos)
+printf("negative breakdown voltage at 5 atm %f kV \n",Vs2neg)