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diff --git a/2015/CH9/EX9.12/9_12.sce b/2015/CH9/EX9.12/9_12.sce
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+clc
+//initialisation of variables
+t1=303 //temparature in k
+p2=4.08 //pressure in bar
+p1=1 //pressure in bar
+t5=303 //temparature in k
+x=0.3247 //x=v2/v1 where the relation is v2=v1*(1/rp)^1/n
+y=0.0385 //y=v3/v1
+vo=0.2862 //vo=volume of air delivered/v1
+vf=0.8299 //vf=vome of free air /v1
+n=1.25
+p3=17.5 //pressure in bar
+r=0.287
+tatm=2911 //temp in k
+patm=1.02 //pressure in bar
+w=291 
+//CALCULATIONS
+t2=(t1*(p2/p1)^((n-1)/n))
+veff=vf/(1-y)
+a=(r*(t2-t1)*5)
+t3=(t1*(p3/p2)^((n-1)/n))
+hp=(5*r*(t3-t1))
+iso=(r*tatm*log(p3/patm))/10 //its ln
+ieff=iso/w
+//RESULTS
+printf('volumetric efficiency is %2f',veff)
+printf('\nwork required for lp cyclinder is %2f',a)
+printf('\nwork required for hp cyclinder is %2f',hp)
+printf('\nwork required for isothermal is %2f',iso)
+printf('\nisothermal efficiency is %2f',ieff)