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diff --git a/389/CH3/EX3.3/Example3_3.sce b/389/CH3/EX3.3/Example3_3.sce
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+clear;
+clc;
+
+// Illustration 3.3
+// Page: 69
+
+printf('Illustration 3.3 - Page: 69\n\n');
+
+// solution
+
+// Heat transfer analog to Eqn. 3.12
+// The Eqn. remains the same with the dimensionless conc. ratio replaced by ((tl-to)/(ti-to))
+
+// The dimensionless group:
+// eta = 2*Dab*L/(3*del^2*velocity);
+// eta = (2/3)*(Dab/(del*velocity))*(L/del);
+// Ped = Peclet no. for mass transfer
+// eta = (2/3)*(1/Ped)*(L/del);
+
+// For heat transfer is replaced by
+// Peh = Peclet no. for heat transfer
+// eta = (2/3)*(1/Peh)*(L/del);
+// eta = (2/3)*(alpha/(del*velocity))*(L/del);
+// eta = (2*alpha*L)/(3*del^2*velocity);
+printf('Heat transfer analog to Eqn. 3.21 is eta = (2*alpha*L)/(3*del^2*velocity)');
+\ No newline at end of file