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diff --git a/3523/CH3/EX3.7.18/Ex3_18.sce b/3523/CH3/EX3.7.18/Ex3_18.sce
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+//Example 18// Ch 3
+clc;
+clear;
+close;
+// given data
+E = 250; //electric field in V/m
+r1 = 0.3*10^-3//intial diameter of cloud in meters
+k = 1.38*10^-23;//in m2 kg s-2 K-1
+T = 293; //in kelvin
+e = 1.6*10^-19;// in couloumb
+z = 0.05;//drift distance in meters
+r = (6*k*T*z)/(e*E);//diameter before drift
+printf("diameter before drift %e m \n",r)
+r2 = sqrt (r1^2 + r );//diamter after drifting a distance
+printf("diameter after drift %e m \n",r2)
+// round off value calculated for r and r2