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diff --git a/1394/CH19/EX19.1.1/Ex19_1_1.sce b/1394/CH19/EX19.1.1/Ex19_1_1.sce
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+
+
+clc
+//initialization of variables
+VP = 0.045*10^-3// Vapor pressure of permethrin in kg/m-sec^2
+R = 8.31 // Gas constant in kg-m^2/sec^2-gmol-K
+l = 63*10^-6 // membrane thickness in m
+A = 12*10^-4 // area surrounded by the membrane in m^2
+M1 = 19*10^-3 // Permithrin release in gmol
+t = 24*3600 // time taken to release
+T = 298 // Kelvin
+MW = 391 // Mol wt
+//Calculations
+c1 = VP/(R*T) // C1sat 
+P = (M1/(t*MW))*(l/c1)*(1/A)*10^-3 //Permeability in cm^2/sec
+//Results
+printf("The permeability is %.1e m^2/sec",P)