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diff --git a/686/CH4/EX4.4/Ex4_4.sci b/686/CH4/EX4.4/Ex4_4.sci
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+clc();
+clear;
+
+// To calculate the time needed to estabilish a steady state temperature distribution in the walls and in the room
+tf = 70;                            // Final temperature of the wall in F
+hi = 1.2;                           // Inner heat transfer coefficint of wall i Btu/hr-ft^2-degF
+ho = 3.0;                            // Outer heat transfer coefficient in Btu/hr-ft^2-degF
+a = 0.012;                           // Thermal diffusivity in ft^2/hr
+x = 1.3;                            // Thickness of wall in ft
+
+// Assuming the rate of heat trasfer to the inside of a wall is constant
+// And since the wall is divided into six sections 
+delx = x/6;                        // Thickness of sections in ft
+t = (delx)^2/(2*a);                  // time required in hr
+printf("the time needed to estabilish a steady state temperature distribution in the walls and in the room is %.2f hr",t);
+