initial commit / add all books

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+printf("\t example 17.4 \n");

+printf("\t approximate values are mentioned in the book \n");

+// The area between the saturation line and the operating line represents the potential for heat transfer

+// at T=79.3F

+Hs=43.4; // fig 17.12

+H=30.4; // fig 17.12

+d1=(Hs-H);

+printf("\t difference is : %.1f \n",d1);

+//at t=85

+Hs=50; // fig 17.12

+H=35.7; // fig 17.12

+d2=Hs-H;

+printf("\t difference is : %.1f \n",d2);

+d=(d1+d2)/(2);

+printf("\t average of difference is : %.2f \n",d);

+dT=(85-79.3); // F

+nd1=(dT/d);

+printf("\t nd1 is : %.3f \n",nd1);

+// similarly calculating nd at each temperature and adding them will give you total nd value

+nd=1.72;

+printf("\t number of diffusing units : %.2f \n",nd);

+// end