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:
Physics
Density of mass
- Density, mass per unit volume
- Bulk density, mass of a particulate solid or powder divided by the volume it occupies
- Particle density (packed density) or true density, density of the particles that make up a particulate solid or a powder
- Neutral density, mass density of seawater
- Area density or surface density, mass over a (two-dimensional) area
- Linear density, mass over a (one-dimensional) line
- Relative density or specific gravity, a measure of density in comparison to the density of something else
- Vapour density, a relative density used for gases
Densities of other entities
- Mass-specific quantity, the quotient of a physical quantity and mass
- Specific energy, energy per unit mass
- Volume-specific quantity, the quotient of a physical quantity and volume
- Charge density, the electric charge per volume
- Energy density, potential energy per unit volume
- Force density, force per unit volume
- Power density, power per unit volume
- Particle density (particle count), number of particles per unit volume
- Area-specific quantity, the quotient of a physical quantity and area
- Current density, the ratio of electric current to area
- Surface power density, power per unit area
Other:
- Number density, number of particles per unit volume, area, or length
- Optical density, the absorbance of a material
- Densitometry, measuring the optical density of photographic paper, photographic film and x-ray film
Mathematics
Probability and measure theory
- Probability density function, a function which maps probabilities across the real line and whose integral is 1
- Density estimation is the construction of an estimate of a probability density function
- Kernel density estimation, used in statistics to estimate a probability density function of a random variable
- Lebesgue's density theorem
Number theory
- Schnirelmann density
- Natural density (also called asymptotic density)
- Dirichlet density
Geometry
- Packing density
- Density (polytope)
- Density on a manifold
- Tensor density in differential geometry
Topology
- Dense set and nowhere dense set
- Dense-in-itself is a set that contains no isolated points
Other fields
- Density (graph theory), the fraction of possible edges that exist in a graph
- Dense order in order theory
- A coinitial subset in the mathematical theory of forcing, in set theory
- Dense submodule in abstract algebra
Other scientific fields
- Population density, population per unit land area
- Urban density, in urban planning and urban design
- Areal density (computer storage), bits (how computers store information) over an amount of area or volume
- Nutrient density, the proportion of any array of a single nutrient or nutritional factor, or of numerous nutrients in foods, often ordered by different scalar indices
Culture and arts
- Stupidity, a stupid person is sometimes referred to as being "dense"
- Dense (film), a 2004 film
- Density 21.5 – a piece of music for solo flute written by Edgard Varèse
See also
Topics referred to by the same term
This disambiguation page lists articles associated with the title Density.If an internal link led you here, you may wish to change the link to point directly to the intended article. Categories: