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diff --git a/629/CH12/EX12.12/example12_12.sce b/629/CH12/EX12.12/example12_12.sce
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+clear
+clc
+//Example 12.12 MASS FLOW IN TRUNCATED NOZZLE
+k=1.4;
+d=0.03; //diameter[m]
+A=%pi*d^2/4 //area[m^2]
+pt=160; //[kPa]
+pb=100; //[kPa]
+Tt=273+80; //total temp.[K]
+//Mach number at exit
+Me=sqrt((2/(k-1))*[(pt/pb)^((k-1)/k)-1])
+//Static temperature at exit
+Te=Tt/(1+((k-1)/2)*Me^2) //[K]
+R=287; //[J/kg.K]
+//Static density at exit
+rho=pb*10^3/(R*Te) //[kg/m^3]
+c=sqrt(k*R*Te) //speed of sound[m/s]
+//Mass flow rate
+m=rho*A*Me*c //[kg/s]
+printf("\n The mass flow rate = %.3f kg/s.\n",m)
+\ No newline at end of file