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+clc();
+clear;
+
+ // To calculate the heat exchange by radiation between two walls
+
+ t1 = 212; // Temperature of contents in the bottle in F
+ t2 = 68; // Ambient temperature in F
+
+ e = 0.02 ; // Emmisivity of silver
+ e12 = 1/(2/e-1); // Exchange factor
+ s = 0.173*10^-8; // Stephens boltzmanns constant
+
+ q = s*e12*((t1+460)^4-(t2+460)^4); // Heat loss in Btu/hr
+ printf("The heat flow per unit area of the inner wall is %.2f Btu/hr-ft^2",q); \ No newline at end of file