ABSTRACT
The The world around us has a bewildering variety of materials. From the atomic point of view, discussed in our study of atoms in Chapter 4, all materials are made out of an enormous number of atoms; a typical object that we can sense has about 1023 atoms. We have to unravel how do trillions upon trillions upon trillions of atoms come together to form materials that have simple macroscopic properties such as toughness, plasticity, malleability and so on.
