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+clear ;
+clc;
+// Example 19.1
+printf('Example 19.1\n\n');
+//Page No. 563
+// Solution 
+ 
+// Use phase rule to get degree of freedom(F) =  2-P+C 
+// (a)
+N1 = 1;
+P1 = 1 ;// Number of phases present
+C1 = 1 ;//Number of components present
+F1 = 2-P1+C1 ;//Number of degree of freedom
+printf('\n (a) Number of degree of freedom of pure benzene is %i. Therefore %i additional intensive variables must be specified to fix the system.\n ',F1,F1);
+
+// (b)
+N2 = 1;
+P2 = 2 ;// Number of phases present
+C2 = 1 ;//Number of components present
+F2 = 2-P2+C2 ;//Number of degree of freedom
+printf('(b) Number of degree of freedom of a mixture of ice and water only is %i. Therefore %i additional intensive variables must be specified to fix the system.\n ',F2,F2);
+
+// (c)
+N3 = 2;
+P3 = 2 ;// Number of phases present
+C3 = 2 ;//Number of components present
+F3 = 2-P3+C3 ;//Number of degree of freedom
+printf('(c) Number of degree of freedom of a mixture of liquid benzene,benzene vapour and helium gas is %i. Therefore %i additional intensive variables must be specified to fix the system.\n ',F3,F3);
+
+// (d)
+N4 = 2;
+P4 = 2 ;// Number of phases present
+C4 = 2 ;//Number of components present
+F4 = 2-P4+C4 ;//Number of degree of freedom
+printf('(d) Number of degree of freedom of a mixture of salt and water designed to achieve a specific vapour pressure is %i. Therefore %i additional intensive variables must be specified to fix the system.\n ',F4,F4);
+\ No newline at end of file