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diff --git a/2015/CH9/EX9.11/9_11.sce b/2015/CH9/EX9.11/9_11.sce
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+
+clc
+//initialisation of variables
+r=0.287
+p=1.01325 //pressure in bar
+v=5 //volume in m*m*m
+t=288 //temparature in k
+t1=303 //temparature in k
+t2=403 //temparature in k
+p2=4.08 //pressure in bar
+p1=0.98 //pressure in bar
+p3=17 //pressure in bar
+n=1.25
+c=0.06 //clearance volume by swept volume
+//CALCULATIONS
+m=(p*v)/(r*t)
+rp=p2/p1
+t2s=(t1*(p2/p1)^((n-1)/n))
+wr=(n/n-1)*r*(t2-t1)
+wc=2*wr
+veff=(1+c-c*(rp)^(1/n))
+x=(p*100*v*t1)/(p1*100*t) //x=(v1-v4)
+vs=x/veff
+vsc=vs/125
+d1=((4*vsc)/%pi)^(1/3)
+//RESULTS
+printf('volumetric efficiency is %2f',veff)
+printf('\nstoke volume is %2fm*m*m/min',vs)
+printf('\nstroke volume per cycle is %2fm*m*m',vsc)
+printf('\nstoke of piston is %2f',d1)