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+clear;
+clc;
+
+// Illustration 13.1
+// Page: 722
+
+printf('Illustration 13.1 - Page: 722\n\n');
+
+// Solution 
+
+//***Data***//
+Density_L = 1137;// [kg/cubic m]
+Density_S = 960;// [kg/cubic m]
+Density_p = 1762;// [kg/cubic m]
+A_prime = 16.4;// [square m/kg]
+g = 9.81;// [square m/s]
+sigma = 0.066;// [N/m]
+Z = 3;// [m]
+dia = 1;// [m]
+//**********//
+
+e = 1-(Density_S/Density_p);// [fraction void]
+ap = A_prime*Density_S;// [square m/cubic m]
+// By Eqn. 6.67:
+dp = 6*(1-e)/ap;// [m]
+// By Eqn. 13.6:
+K = dp^2*e^3*g/(150*(1-e)^2);// [cubic m/s]
+check = K*Density_L*g/(g*sigma);
+if check<0.02
+    // By Eqn. 13.3: 
+    So = 0.075;
+else
+    // By Eqn. 13.4:
+    So = 0.0018/(check)
+end
+// By Eqn. 13.2:
+ZD = (0.275/g)/((K/g)^0.5*(Density_L/sigma));// [m]
+// By Eqn. 13.1:
+Sav = ((Z-ZD)*So/Z)+(ZD/Z);
+// VolRatio=Vol liquid retained/Vol bed.
+VolRatio = Sav*e;
+printf("Vol liquid retained/Vol bed : %f cubic m/cubic m\n",VolRatio);
+Mass = VolRatio*%pi*dia^2*Z*Density_L/4;// [kg]
+// Mass ratio=Mass Liquid/Mass dry solid
+MassRatio = VolRatio*Density_L/(Density_S);
+printf("Mass liquid/Mass dry solid: %f kg/kg\n",MassRatio);
+\ No newline at end of file