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diff --git a/629/CH5/EX5.7/example5_7.sce b/629/CH5/EX5.7/example5_7.sce
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+clear
+clc
+//Example 5.7 DEPRESSURIZATION OF GAS IN TANK
+V=10; //volume[m^3]
+po=500; //initial pressure[kPa]
+pf=400; //final pressure[kPa]
+R=518; //gas constant[J/kg.K]
+T=300; //[K]
+A=10^-7; //area[m^2]
+//mi=0,mo=0.66*p*A/sqrt(R*T), mcv=mi-mo
+//continuity equation, mi=V*d(rho)/dt
+t=integrate('-V*(0.66*A*p*sqrt(R*T))^(-1)','p',po,pf)
+printf("\nThe time elapsed for the absolute pressure drop = %.f s.\n",t)
+\ No newline at end of file