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+// Calculation of relative humidity ,humid volume enthalpy and heat required if 100m^3 of this air is heated to 110 degree
+clear;
+clc;
+printf("\t Example 5.9\n");
+
+//part(i)
+y_bar=.03;                   // humidity inkg water /kg dry air
+pt=760;                     //total pressure in pascal
+pa2=118;                    //final pressure
+y=y_bar/(18/28.84);        //humidity kmol water vapour/kmol dry air
+pa=(y*pt)/(y+1);           //partial pressure
+rh=pa/pa2;                  //relative humidity
+sh=pa2/(pt-pa2);            //saturated humidity
+ph=(y/sh)*100;                //percentage humidity
+printf("\n percentage humidity is :%f",ph);
+
+///part(ii)
+Ma=18;                      //molecular weight
+Mb=28.84;                    //molecular weight
+Tg=55;                       //temperature of mixture
+pt=1.013*10^5;            //total pressure in pascal
+VH=8315*[(1/Mb)+(y_bar/Ma)]*[(Tg+273)/pt];        //humid volume in m^3mixture/kg of dry air
+printf("\n we get VH humid volume as  :%f m^3/kg dry air",VH);
+
+
+//part(iii)
+Ca=1005;
+Cb=1884;
+Cs=Ca+Cb*y_bar;                //humid heat  in j/kg dry air degree celcius
+printf("\n we get humid heat as \t :%f j/kg dry air degree celcius ",Cs);
+d=2502300;                    //latent heat in j/kg
+H=Cs*(Tg-0)+y_bar*d;         //enthalpy for refrence temperature of 0 degree
+printf("\n we get H enthalpy as \t :%f j/kg",H);
+
+//part(iv)
+v=100;                        //volume of air
+mass=v/VH;                    //mass of dry air
+Tg=110;                       //temperature of mixture
+d=2502300;                    //latent heat in j
+H_final=Cs*(Tg-0)+y_bar*d;    //enthalpy for refrence temperature of 0 degree
+H_added=(H_final-H)*102.25;     //HEAT added  in kj     
+printf("\n we get heat added as \t :%f kj",H_added/1000);
+//end
+\ No newline at end of file