Solids, considered in this chapter, are the most organized form of matter. Liquids are between the two other states in terms of organization. Liquids are practically non-compressible because the molecules are already close together.
Liquids exhibit a resistance to flow called viscosity .
Viscosity and surface tension are related to the forces of attraction between molecules. This will be discussed later in this document. Properties of Solids Solids are even less compressible than liquids. Solids retain both volume and shape. Amorphous forms are rather unusual, although one of the most common examples of this form is ordinary glass.