The word density or dense has a variety of senses in the physical, mathematical, and quantitative sciences.

In Physics: Since antiquity, people have tried to understand the behavior of matter: why unsupported objects drop to the ground, why different materials have different properties, and so forth. ...

• Density, area density, linear density and Planck density are types of mass-density
• Relative density (specific gravity) and vapour density are measures of density in comparison to the density of something else
• Charge density is the electric charge per unit area or per unit volume and current density is the ratio of electric current to volume
• Energy density
• Force density
• Information density

In Demographics: Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... The area density of a two-dimensional object is calculated as the mass per unit area. ... The linear density of a one-dimensional object is calculated as the mass per unit length of the object. ... The Planck density is the natural unit of density, denoted by ρP. ρP = Planck mass / (Planck length)3 = ≈ 5. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... Vapour density refers to the density of a vapour in relation to that of hydrogen. ... Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interactions. ... In electricity, current is the rate of flow of charges, usually through a metal wire or some other electrical conductor. ... In electricity, current is the rate of flow of charges, usually through a metal wire or some other electrical conductor. ... Vacuum energy or zero-point energy is the energy density of empty space. ... In fluid mechanics, the force density is a vector field representing the flux density of the hydrostatic force within the bulk of a fluid. ... Demographics is a shorthand term for population characteristics. Demographics include age, income, mobility (in terms of travel time to work or number of vehicles available), educational attainment, home ownership, employment status, and even location. ...

• Population density

In Computer science: Wikibooks Wikiversity has more about this subject: School of Computer Science Open Directory Project: Computer Science Downloadable Science and Computer Science books Collection of Computer Science Bibliographies Belief that title science in computer science is inappropriate nacho Categories: Computer science ...

• Computer storage density is the amount of data which can be stored in a computer storage medium

In Statistics: Computer storage density is a measure of the quantity of information bits that can be stored on a given length of track, area of surface, or in a given volume; of a computer storage medium. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Statistics is a type of data analysis which practice includes the planning, summarizing, and interpreting of observations of a system possibly followed by predicting or forecasting of future events based on a mathematical model of the system being observed. ...

• Probability density function

In Pure Mathematics: In mathematics, a probability density function (pdf) serves to represent a probability distribution in terms of integrals. ... Wikibooks Wikiversity has more about this subject: School of Mathematics Wikiquote has a collection of quotations by or about: Mathematics Look up Mathematics on Wiktionary, the free dictionary Wikimedia Commons has more media related to: Mathematics Bogomolny, Alexander: Interactive Mathematics Miscellany and Puzzles. ...

• Schnirelmann density in number theory
• asymptotic density in number theory
• natural density in number theory
• nowhere dense set and dense set in topology
• A partial order on a set S is said to be dense (or dense-in-itself) if, for all x and y in S for which x < y, there is a z in S such that x < z < y. The rational numbers with the ordinary ordering are a densely ordered set in this sense, as are the real numbers.
• In order theory, a subset B of a partially ordered set A is dense in A if for any x < y in A, there is some z in B such that x < z < y. In case the order is a linear order, then B is dense in A in the present sense if and only if B is dense in the order topology on A. Hence the first two meanings above are related.
• In forcing, a subset D of a forcing notion (P, ≤ ) is called dense in P if for any p in P there is d in D with d≤p. (Note: since a forcing notion is also a partial order, this usage of the word "dense" conflicts with the definition given above. However, the above notion of "density" is practically never used when talking about forcing notions, so any ambiguities are usually easily resolved from the context.)

In Spirituality: In mathematics, the Schnirelmann density of a sequence of numbers is a way to measure how dense the sequence is. ... Traditionally, number theory is that branch of pure mathematics concerned with the properties of integers. ... In mathematics, a sequence a1, a2, ... , an, with the aj positive integers and aj < aj+1 for all j, has natural density (or asymptotic density) α, where 0 ≤ α ≤ 1, if the proportion of natural numbers included as some aj is asymptotic to α. More formally, if we define the counting function A... Traditionally, number theory is that branch of pure mathematics concerned with the properties of integers. ... In mathematics, a sequence a1, a2, ... , an, with the aj positive integers and aj < aj+1 for all j, has natural density α, where 0 ≤ α ≤ 1, if the proportion of natural numbers included as some aj is asymptotic to α. More formally, if we define the counting function A(x) as the... In topology, a subset A of a topological space X is called nowhere dense if the interior of the closure of A is empty. ... In topology and related areas of mathematics a subset A of a topological space X is called dense (in X) if the only closed subset of X containing A is X itself. ... Topology (Greek topos, place and logos, study) is a branch of mathematics concerned with the study of topological spaces. ... In mathematics, a partially ordered set (or poset for short) is a set equipped with a special binary relation which formalizes the intuitive concept of an ordering. ... In mathematics, a set can be thought of as any collection of distinct things considered as a whole. ... Order theory is a branch of mathematics that studies various kinds of binary relations that capture the intuitive notion of a mathematical ordering. ... In mathematics, the order topology is a topology that can be defined on any totally ordered set. ... In axiomatic set theory, forcing is a technique, invented by Paul Cohen, for proving consistency and independence results with respect to the Zermelo-Fraenkel axioms. ... Spirituality is, in a narrow sense, a concern with matters of the spirit, however that may be defined; but it is also a wide term with many available readings: it may include belief in supernatural powers, as in religion; but the emphasis is on personal experience. ...

• Spiritual density describes states of being for various planes of existence.

One droplet in a vast ocean. ... In metaphysics and esoteric cosmology, a plane of existence (sometimes called simply a plane, dimension, vibrating plane, or an inner, invisible, spiritual, or supraphysical world) is a theoretical region of space and/or consciousness beyond the known physical universe, or the region containing the universe itself. ...

Density, the band

Density is also the name of an Italian progressive band. Their repertoire varies from the pub project (covers of Queen, Guns n'roses, Europe...) and their composition project (inspirations from Dream Theater, Extreme, Yes...). [1]