Density (volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case...

Population density (in agriculture: standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans...

This is a list of countries and dependencies ranked by population density, sorted by inhabitants per square kilometre or square mile. The list includes...

In probability theory, a probability density function (PDF), density function, or density of an absolutely continuous random variable, is a function whose...

Relative density, also called specific gravity, is a dimensionless quantity defined as the ratio of the density (mass of a unit volume) of a substance...

is finite, one may compute the energy spectral density. More commonly used is the power spectral density (PSD, or simply power spectrum), which applies...

In quantum mechanics, a density matrix (or density operator) is a matrix that describes an ensemble of physical systems as quantum states (even if the...

pixels per centimetre (ppcm or pixels/cm) are measurements of the pixel density of an electronic image device, such as a computer monitor or television...

Critical density may refer to: Critical density (cosmology), the matter density of a spatially flat Universe Critical density (thermodynamics), the density of...

Power density, defined as the amount of power (the time rate of energy transfer) per unit volume, is a critical parameter used across a spectrum of scientific...

In physics, energy density is the quotient between the amount of energy stored in a given system or contained in a given region of space and the volume...

electromagnetism, polarization density (or electric polarization, or simply polarization) is the vector field that expresses the volumetric density of permanent or induced...

The density of air or atmospheric density, denoted ρ, is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with...

In number theory, natural density, also referred to as asymptotic density or arithmetic density, is one method to measure how "large" a subset of the...

Disk density is a capacity designation on magnetic storage, usually floppy disks. Each designation describes a set of characteristics that can affect...

Paper density is a paper product's mass per unit volume. The density can be calculated by dividing the grammage of paper (in grams per square metre or...

District of Columbia by population density, population size, and land area. It also includes a sortable table of density by states, territories, divisions...

Vapour density is the density of a vapour in relation to that of hydrogen. It may be defined as mass of a certain volume of a substance divided by mass...

number density, two-dimensional areal number density, or one-dimensional linear number density. Population density is an example of areal number density. The...

Bone density, or bone mineral density, is the amount of bone mineral in bone tissue. The concept is of mass of mineral per volume of bone (relating to...

Keyword density is the percentage of times a keyword or phrase appears on a web page compared to the total number of words on the page. In the context...

electromagnetism, charge density is the amount of electric charge per unit length, surface area, or volume. Volume charge density (symbolized by the Greek...

The area density (also known as areal density, surface density, superficial density, areic density, mass thickness, column density, or density thickness)...

Lebesgue's density theorem states that for any Lebesgue measurable set A ⊂ R n {\displaystyle A\subset \mathbb {R} ^{n}} , the "density" of A is 0 or...

matter physics, the density of states (DOS) of a system describes the number of allowed modes or states per unit energy range. The density of states is defined...

In materials science, bulk density, also called apparent density, is a material property defined as the mass of the many particles of the material divided...

density include: Density, mass per unit volume Bulk density, mass of a particulate solid or powder divided by the volume it occupies Particle density...

ULDL by the overall density naming convention), very low-density lipoprotein (VLDL), intermediate-density lipoprotein (IDL), low-density lipoprotein (LDL)...

In statistics, probability density estimation or simply density estimation is the construction of an estimate, based on observed data, of an unobservable...

A packing density or packing fraction of a packing in some space is the fraction of the space filled by the figures making up the packing. In simplest...