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diff --git a/1052/CH26/EX26.5/265.sce b/1052/CH26/EX26.5/265.sce
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+clc;
+//Example 26.5
+//page no 389
+printf("Example 26.5 page no 389\n\n");
+//air  flowing through a 10 ft packed bed
+V_o=4.65//superficial velocity,ft/s
+meu_g=1.3e-5//viscosity of air 
+rho_g=0.67//density of air,lb/ft^3
+e=0.89//void volume
+g_c=32.2//grav. constant
+L=10//length of packed bed 
+d_p=0.007815//effective particle diameter
+P_drop = [(150*V_o*meu_g/(g_c*d_p^2))*((1-e)^2/e^3) + (1.75*rho_g*V_o^2/(g_c*d_p))*((1-e)^2/e^3)]*L//pressure drop
+printf("\n pressure drop P_rop=%f lb/ft^2",P_drop);//calculation error in book 
+