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diff --git a/2510/CH9/EX9.1/Ex9_1.sce b/2510/CH9/EX9.1/Ex9_1.sce
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+//Variable declaration:
+D = 1.0                     //Diamete of vessel (ft)
+L = 1.5                     //Length of vessel (ft)
+T1 = 390.0                  //Surface temperature of vessel (°F)
+T2 = 50.0                   //Surrounding temperature of vessel (°F)
+h = 4.0                     //Convective heat transfer coefficient (Btu/h.ft.°F)
+pi = %pi
+
+//Calculation:
+A = pi*D*L+2*pi*(D/2)**2    //Total heat transfer area (ft^2)
+Q = h*A*(T1-T2)             //Rate of heat transfer (Btu/h)
+R = 1/(h*A)                 //Thermal resistance (°F.h/Btu)
+
+//Result:
+printf("The thermal resistance of vessel wal is : %.4f  °F.h/Btu.",R)