# Density (disambiguation)

Density and dense usually refer to a measure of how much of some entity is within a fixed amount of space. Types of density include:

In physics, density of mass:

• Density, mass per unit volume
• The Planck density, the derived unit of density in the Planck unit system (1 Planck mass divided by 1 Planck volume)
• Area density or surface density, mass over a (two-dimensional) area
• Linear density, mass over a (one-dimensional) line
• Bulk density, mass of many particles of a particulate solid or a powder divided by the total volume they occupy
• Particle density or true density, density of the particles that make up a particulate solid or a powder
• Relative density or specific gravity, a measure of density in comparison to the density of something else

In physics, densities of entities other than mass:

In mathematics:

In other scientific fields:

Density can also refer to:

• Spiritual density, levels of spiritual evolution, planes of existence or "dimensions" in The Law of One
• Stupidity, a stupid person is sometimes referred to as being "dense"

In Arts: