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diff --git a/581/CH11/EX11.15/Example11_15.sce b/581/CH11/EX11.15/Example11_15.sce
new file mode 100755
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+++ b/581/CH11/EX11.15/Example11_15.sce
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+
+clear ;
+clc;
+
+printf("\t Example 11.15\n");
+T1=1473;          //suraface temp.of hot water,K
+x=0.05;        //mass fraction of water
+Gm=0.017;       //average mass  transfer coefficient,kg/(m^2*s)
+A=0.04;        //suraface area of pan,m^2
+
+//only water vapour passes through the liquid surface, since air is not strongly absorbed into water under normal conditions.
+
+p=38.58*1000;       // saturation pressure of water,kPa
+Xwater=p/101325;    //mole fraction of saturated water
+Mwater=Xwater*18.02/(Xwater*18.02+(1-Xwater)*28.96);    //mass fraction of saturated water
+
+B=(x-Mwater)/(Mwater-1);    //mass transfer driving force
+m=Gm*B*A;            //evaporation rate,kg/s
+printf("\t evaporation rate is:%f kg/s or 769 g/hr.",m);
+//end
+\ No newline at end of file