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diff --git a/2015/CH9/EX9.4/9_4.sce b/2015/CH9/EX9.4/9_4.sce
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+++ b/2015/CH9/EX9.4/9_4.sce
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+clc
+//initialisation of variables
+p2=4.08 //pressure in bar
+p1=1 //pressure in bar
+n=1.22
+r=0.287
+p=1.01325 //pressure in bar
+v=145 //volume
+t=288 //temparature in k
+p3=17.5 //pressure in bar
+t1=307 //temp in k
+t2=313 //temp in k
+//CALCULATIONS
+wlp=5.54*r*t1*(((p2/p1)^((n-1)/n))-1)
+whp=5.54*r*t2*(((p2/p1)^((n-1)/n))-1)
+w=wlp+whp
+m=(p*v)/(r*t)
+pr=(w*m)/60
+p2=(p1*p3)^0.5
+x=(p2)^0.5 //x=d1/d2
+//RESULTS
+printf('total work required is %2fknm/kg',w)
+printf('\nmass of free air is %2fkg/min',m)
+printf('\npower required to drive the compressor is %2fkw',pr)
+printf('\nratio of cylinder diameters is %2f',x)