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diff --git a/617/CH16/EX12.3/Example16_3.sci b/617/CH16/EX12.3/Example16_3.sci
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+++ b/617/CH16/EX12.3/Example16_3.sci
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+clc();
+clear;
+
+// To compute the ammonia diffusing through the stagnant air
+
+x=0.1/12;                            // thickness of still air layer in ft
+T=77+460;                            // temperature in degR
+p=1;                                 // Atmospheric pressure in atm
+pa1=0.3;                             // Pressure of ammonia in still air in atm
+pb1=p-pa1;                           // pressure of air in atm
+pa2=0;                               // pressure of ammonia in the absorption plane
+pb2=p-pa2;                           // pressure of air in absorption plane
+pbm=(pb2-pb1)/(log(pb2/pb1));          // Logarithmic mean pressure
+D=0.914;                             // Diffusion coefficient for ammonia
+R=0.729;                             // Gas constant in ft^3-atm/lb-mole-degR
+N=D*p*(pa1-pa2)/(R*T*x*pbm);
+printf("The amount of ammonia diffusing through the stagnant air is %.1f lb-mol/hr-ft^2",N);
+\ No newline at end of file