Solution for Plastics: Materials and Processing 3rd Edition Chapter 3, Problem 1

by A. Brent Strong
430 Solutions 23 Chapters 72042 Studied ISBN: 9780131145580 Mechanical Engineering 5 (1)

Chapter 3, Problem 1 : 1. Contrast the interatomic or intermolecular forces present...

1. Contrast the interatomic or intermolecular forces present in solids, liquids and gases. Explain the consequences of these forces and how these forces are normally overcome.

Step-By-Step Solution

1. In solids the inter-atomic and intermolecular forces are very strong. The particles (atoms or molecules) are relatively fixed in relation to all the surrounding particles. These materials resist movements of the particles. Hence, solids are rigid. In liquids the inter-particle forces are less strong than in solids, but there is still some association between the particles. The particles can move freely to take the shape of the container but will not fill the entire volume of the container. In gases the inter-particle forces are nearly non-existent. Gases can take both the shape and fill the volume of the container. The inter-particle forces are normally overcome by adding thermal energy to the material. This thermal energy causes the particles to vibrate, rotate, and translate, thus eventually breaking the interparticle forces.

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