• 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...
    35 KB (3,299 words) - 11:00, 29 October 2024
  • Thumbnail for Population density
    Population density (in agriculture: standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans...
    15 KB (1,066 words) - 13:55, 10 December 2024
  • Thumbnail for List of countries and dependencies by population density
    This is a list of countries and dependencies ranked by population density, sorted by inhabitants per square kilometre or square mile. The list includes...
    51 KB (980 words) - 16:58, 13 December 2024
  • Thumbnail for Probability density function
    In probability theory, a probability density function (PDF), density function, or density of an absolutely continuous random variable, is a function whose...
    30 KB (4,935 words) - 05:01, 27 December 2024
  • Thumbnail for Relative density
    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...
    39 KB (5,966 words) - 15:04, 29 October 2024
  • Thumbnail for Spectral density
    is finite, one may compute the energy spectral density. More commonly used is the power spectral density (PSD, or simply power spectrum), which applies...
    36 KB (5,666 words) - 05:12, 24 September 2024
  • 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...
    36 KB (5,310 words) - 11:52, 4 December 2024
  • 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...
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  • Critical density may refer to: Critical density (cosmology), the matter density of a spatially flat Universe Critical density (thermodynamics), the density of...
    385 bytes (81 words) - 09:11, 12 October 2013
  • 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...
    4 KB (413 words) - 12:23, 5 August 2024
  • 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...
    63 KB (4,088 words) - 04:21, 8 December 2024
  • 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...
    11 KB (1,757 words) - 00:54, 29 August 2024
  • 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...
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  • Thumbnail for Polarization density
    electromagnetism, polarization density (or electric polarization, or simply polarization) is the vector field that expresses the volumetric density of permanent or induced...
    24 KB (3,379 words) - 06:28, 26 December 2024
  • number density, two-dimensional areal number density, or one-dimensional linear number density. Population density is an example of areal number density. The...
    7 KB (809 words) - 06:17, 22 April 2024
  • Thumbnail for Disk density
    Disk density is a capacity designation on magnetic storage, usually floppy disks. Each designation describes a set of characteristics that can affect...
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  • Thumbnail for Paper density
    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...
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  • 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...
    3 KB (398 words) - 08:55, 10 August 2024
  • The area density (also known as areal density, surface density, superficial density, areic density, mass thickness, column density, or density thickness)...
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  • Thumbnail for List of states and territories of the United States by population density
    District of Columbia by population density, population size, and land area. It also includes a sortable table of density by states, territories, divisions...
    10 KB (473 words) - 04:51, 30 November 2024
  • ecology, density-dependent processes occur when population growth rates are regulated by the density of a population. This article will focus on density dependence...
    12 KB (1,440 words) - 08:18, 15 December 2024
  • 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...
    3 KB (451 words) - 23:09, 8 May 2024
  • Thumbnail for Bone density
    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...
    18 KB (1,936 words) - 17:09, 10 December 2024
  • 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...
    3 KB (397 words) - 00:41, 21 December 2021
  • 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...
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  • density include: Density, mass per unit volume Bulk density, mass of a particulate solid or powder divided by the volume it occupies Particle density...
    4 KB (495 words) - 02:52, 16 October 2023
  • Thumbnail for Density of states
    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...
    36 KB (5,578 words) - 07:50, 15 October 2024
  • Thumbnail for Low-density lipoprotein
    ULDL by the overall density naming convention), very low-density lipoprotein (VLDL), intermediate-density lipoprotein (IDL), low-density lipoprotein (LDL)...
    54 KB (6,076 words) - 20:15, 29 November 2024
  • Thumbnail for Charge density
    electromagnetism, charge density is the amount of electric charge per unit length, surface area, or volume. Volume charge density (symbolized by the Greek...
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  • Thumbnail for Density estimation
    In statistics, probability density estimation or simply density estimation is the construction of an estimate, based on observed data, of an unobservable...
    10 KB (1,305 words) - 08:00, 25 September 2024