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+clear;
+clc;
+printf("\t\t\tExample Number 1.3\n\n\n");
+// limiting the heat loss through a fierglass insulating board
+// illustration1.
+// solution
+
+dT = 150;//[degree celsius] temperature drop
+k=0.05;//[W/m degree celcius] thermal conductivity of the board
+q = 100;//[W/m^2] rate of heat loss per unit area
+// heat flux is directly proportional to temperature difference and inversely to thickness
+L = (k*dT)/q; // [m]Thickness of board
+
+
+printf("The thickness of the fibre glass board to limit heat losses to 100W/m^2 should be %f m",L);
+