According to Purdue's Department of Chemistry, a solid is matter that retains a fixed volume and shape. Particles in a solid are rigid and locked in place. More » Science Chemistry States of Matter

Solids hold their shape and have a fixed volume. The molecules in solids are packed closely together and cannot be moved. Solids also have slow diffusion and low vapor pressure. More »

Solids are generally defined as "incompressible," but it is actually possible to compress some to a very small degree. However, it is difficult, and the solids' capacity to be compressed is limited as their particles are... More »

The term matter includes anything that takes up space and has a defined mass. Matter essentially includes all living and nonliving items that have a physical presence: humans, hay bales, butterflies and baseball bats are... More »

Extensive properties are those which depend on the amount of matter present, while intensive properties are those that do not change regardless of the amount of matter present. These are both classes of physical properti... More »

The properties of matter include an object's density, color, mass, volume, length, malleability and ability to change its chemical composition, according to the University of California, Davis. Scientists define matter a... More »

Air is composed of matter. Air is gas, so it is composed of molecules that are spread far apart from each other. More »