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diff --git a/3685/CH19/EX19.4/Ex19_4.sce b/3685/CH19/EX19.4/Ex19_4.sce
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+clc

+// Given that

+m = 3 // Mass flow rate in kg/min

+p1 = 1 // Initial pressure in bar

+T1 = 300 // Initial temperature in K

+p3 = 6 // Pressure after compression in bar

+p5 = 15 // Maximum pressure in bar

+N = 300 // Rpm of compressure

+n = 1.3 // Index of compression and expansion 

+r = 1.5 // Stroke to bore ratio

+R = 287 // Gas constant of air

+t = 15 // Temperature in degree centigrade

+printf("\n Example 19.4\n")

+T = t+273

+Wc = (n/(n-1))*(m/60)*(R*(1e-3)*T1)*(((p3/p1)^((n-1)/n))-1)

+r1 = (p5/p1)^(1/n)// Where r1 = V1/Vc

+r2 = r1-1 // Where r2 = Vs/Vc

+r3 = (p3/p1)^(1/n)

+n_vol = (r1-r3)*(T/T1)/r2

+V = m*R*T/(2*(1e5)*N)

+Vs = V/n_vol

+d = (Vs*4/(%pi*r))^(1/3)

+l = r*d

+printf("\n Power input is %f kW, \n Volumetric efficiency is %f percent, \n Bore of the cylinder is %f m, \n Stroke of the cylinder is %f m",Wc,n_vol*100,d,l)

+//The answers vary due to round off error

+

diff --git a/3685/CH19/EX19.4/Ex19_4.txt b/3685/CH19/EX19.4/Ex19_4.txt
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+ 

+ Example 19.4

+

+ Power input is 9.552761 kW, 

+ Volumetric efficiency is 55.465731 percent, 

+ Bore of the cylinder is 0.184932 m, 

+ Stroke of the cylinder is 0.277398 m 
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