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1. Density: Density (symbol: ρ - Greek: rho) is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less ... [100%] 2023-02-03
2. Density: Density is the amount of mass an object has per unit volume that the object occupies. The most common units of density include kg/L or kg/m in metric units, and lb/gal or lb/ft in imperial units. [100%] 2023-02-18 [Chemical Properties] [Physics]...
3. Density: Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. (Physics) [100%] 2023-11-21 [Density] [Physical quantities]...
4. Density contrast: The Density Contrast is a parameter used in galaxy formation to indicate where there are local enhancements in matter density. It is believed that after inflation, although the universe was mostly uniform, some regions were slightly denser than others with ... (Astronomy) [70%] 2023-12-29 [Physical cosmology] [Inflation (cosmology)]...
5. Single Density: Single Density (einfache Dichte), abgekürzt mit SD oder 1D, ist eine Bezeichnung für die Aufzeichnungsdichte auf älteren Disketten und auch Magnetbändern. Für die Codierung wird das FM-Verfahren verwendet. [70%] 2024-01-19
6. Density topology: The density topology $\mathcal{T}_d$ on $\mathbb R$ consists of the family of all subsets $E\subset \mathbb R$ with the property that every $x\in E$ has density $1$ with respect to the Lebesgue measure $\lambda$, that is ... (Mathematics) [70%] 2024-01-26 [Classical measure theory]
7. Density theorems: The general name for theorems that give upper bounds for the number $N(\sigma,T,\chi)$ of zeros $\rho=\beta+i\gamma$ of Dirichlet $L$-functions $$L(s,\chi)=\sum_{n=1}^\infty\frac{\chi(n,k)}{n^s},$$ where ... (Mathematics) [70%] 2024-01-26 [Number theory]
8. Density topology: The density topology $\mathcal{T}_d$ on $\mathbb R$ consists of the family of all subsets $E\subset \mathbb R$ with the property that every $x\in E$ has density $1$ with respect to the Lebesgue measure $\lambda$, that is ... (Mathematics) [70%] 2023-09-11 [Classical measure theory]
9. Density altitude: The density altitude is the altitude relative to standard atmospheric conditions at which the air density would be equal to the indicated air density at the place of observation. In other words, the density altitude is the air density given ... (Earth) [70%] 2023-11-01 [Atmospheric thermodynamics]
10. Density matrix: of a state $ \rho $ defined on the algebra $ \mathfrak A ( {\mathcal H}) $ of bounded linear operators acting on a Hilbert space $ {\mathcal H} $ The positive nuclear operator $ \widetilde \rho \in \mathfrak A ( {\mathcal H}) $ such that $$ \tag{1 } \rho ( A ... (Mathematics) [70%] 2023-07-12
11. Density hypothesis: A proposed inequality providing a bound for the number $ N( \sigma , T) $ of zeros $ \rho = \beta + i \gamma $ of the Riemann zeta-function $$ \zeta ( s) = \sum _ {n=1} ^ \infty \frac{1}{n ^ {s} } , $$ where $ s = \sigma + it $, in the ... (Mathematics) [70%] 2024-01-12
12. Density meter: A density meter, also known as a densimeter, is a device that measures the density. Density is usually abbreviated as either \displaystyle{ \rho }[/math] or \displaystyle{ D }[/math]. (Physics) [70%] 2022-09-27 [Density] [Measuring instruments]...
13. Density theorems: The general name for theorems that give upper bounds for the number $N(\sigma,T,\chi)$ of zeros $\rho=\beta+i\gamma$ of Dirichlet $L$-functions $$L(s,\chi)=\sum_{n=1}^\infty\frac{\chi(n,k)}{n^s},$$ where ... (Mathematics) [70%] 2023-10-17 [Number theory]
14. Density Records: Density Records ist eine 2007 gegründete Independent-Plattenfirma, die zu Vagrant Records gehört und sich auf Hardcore Punk und Metal, sowie dessen Subgenres spezialisiert hat. Zu den bekanntesten Gruppen, die bei Density unter Vertrag stehen bzw. [70%] 2023-07-22
15. Density gradient: Density gradient is a spatial variation in density over an area. The term is used in the natural sciences to describe varying density of matter, but can apply to any quantity whose density can be measured. [70%] 2023-05-29 [Density] [Spatial gradient]...
16. Density ratio: The density ratio of a column of seawater is a measure of the relative contributions of temperature and salinity in determining the density gradient. At a density ratio of 1, temperature and salinity are said to be compensated: their density ... (Earth) [70%] 2023-11-10 [Physical oceanography]
17. Density method: One of the methods in analytic number theory based on the study of statistics of the distribution of the zeros of the Riemann zeta-function $$ \zeta ( s) = \sum_{n=1} ^ \infty \frac{1}{n ^ {s} } $$ and Dirichlet $L$-functions $$ L ... (Mathematics) [70%] 2024-01-12
18. Density (polytope): In geometry, the density of a star polyhedron is a generalization of the concept of winding number from two dimensions to higher dimensions, representing the number of windings of the polyhedron around the center of symmetry of the polyhedron. It ... (Polytope) [70%] 2023-12-30 [Polytopes]
19. Density (chemistry): Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. The higher an object's density, the higher its mass per volume. (Chemistry) [70%] 2023-06-28
20. Density gradient: Density gradient is a spatial variation in density over an area. The term is used in the natural sciences to describe varying density of matter, but can apply to any quantity whose density can be measured. [70%] 2023-10-21 [Density] [Spatial gradient]...
21. Density of states: In solid-state physics and condensed matter physics, the density of states (DOS) of a system describes the number of modes per unit frequency range. The density of states is defined as \displaystyle{ D(E) = N(E)/V }[/math], where ... (Physics) [57%] 2023-11-04 [Statistical mechanics] [Physical quantities]...
22. Density Functional Theory: Density Functional Theory (DFT) is one of the most popular methods of quantum mechanics. Today it is applied to calculate several molecular properties, for example, binding energies of molecules in chemistry and band structures of solids in physics, but also ... [57%] 2023-10-27 [Quantum mechanics]
23. Video High Density: Video High Density (VHD) is an analog videodisc format which was marketed predominantly in Japan by JVC. There was also a digital audio-only variant, Audio High Density (AHD; not released/canceled). (Engineering) [57%] 2023-02-04 [Video storage]
24. Density functional theory: Density-functional theory (DFT) is a computational quantum mechanical modelling method used in physics, chemistry and materials science to investigate the electronic structure (or nuclear structure) (principally the ground state) of many-body systems, in particular atoms, molecules, and the ... (Computational quantum mechanical modelling method to investigate the electronic structure) [57%] 2023-12-12 [Density functional theory] [Electronic structure methods]...
25. 300 Percent Density: 300 Percent Density is an album by Candiria. Released on May 1, 2001, the album peaked at number 44 on the Billboard Independent Albums chart. [57%] 2023-11-29 [2001 albums] [Candiria albums]...
26. Amsterdam Density Functional: Amsterdam Density Functional (ADF) is a program for first-principles electronic structure calculations that makes use of density functional theory (DFT). ADF was first developed in the early seventies by the group of E. (Software) [57%] 2023-12-20 [Computational chemistry software] [Density functional theory software]...
27. Density functional theory: Density-functional theory (DFT) is a computational quantum mechanical modelling method used in physics, chemistry and materials science to investigate the electronic structure (or nuclear structure) (principally the ground state) of many-body systems, in particular atoms, molecules, and the ... (Computational quantum mechanical modelling method to investigate the electronic structure) [57%] 2023-10-26 [Density functional theory] [Electronic structure methods]...
28. Air Density Explorer: Die Air Density Explorer-Serie (ursprünglich als S-56 bezeichnet) waren Ballonsatelliten, die im Rahmen des Explorer-Programms der NASA gestartet wurden, um die Dichte der Hochatmosphäre zu vermessen. Die Ballonhaut bestand aus abwechselnden Schichten von Aluminium- und Plastikfolie. [57%] 2023-07-02
29. Variable Density Tunnel: The Variable Density Tunnel (VDT) was the second wind tunnel at the National Advisory Committee for Aeronautics (NACA) Langley Research Center. Proposed by German aerospace engineer, Max Munk in May, 1921, it was the world's first variable density wind ... (Organization) [57%] 2023-08-14 [Wind tunnels]
30. Density of air: 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 increasing altitude. (Physics) [57%] 2023-12-30 [Atmospheric thermodynamics] [Density]...
31. Bulk density: Bulk density a property of particulate materials. It is the mass of many particles of the material divided by the volume they occupy. [70%] 2023-12-29 [Density] [Particulates]...
32. Charge density: In electromagnetism, charge density is the amount of electric charge per unit length, surface area, or volume. Volume charge density (symbolized by the Greek letter ρ) is the quantity of charge per unit volume, measured in the SI system in coulombs ... (Physics) [70%] 2023-12-31 [Density] [Electric charge]...
33. Electron density: Electron density or electronic density is the measure of the probability of an electron being present at an infinitesimal element of space surrounding any given point. It is a scalar quantity depending upon three spatial variables and is typically denoted ... (Physics) [70%] 2023-11-08 [Electron] [Atomic physics]...
34. Polarization density: In classical electromagnetism, polarization density (or electric polarization, or simply polarization) is the vector field that expresses the volumetric density of permanent or induced electric dipole moments in a dielectric material. When a dielectric is placed in an external electric ... (Vector field describing the density of electric dipole moments in a dielectric material) [70%] 2023-12-08 [Electric and magnetic fields in matter]
35. Hausdorff density: In measure theory, a field of mathematics, the Hausdorff density measures how concentrated a Radon measure is at some point. Let \displaystyle{ \mu }[/math] be a Radon measure and \displaystyle{ a\in\mathbb{R}^{n} }[/math] some point in Euclidean ... [70%] 2023-04-13 [Measure theory]
36. Triple density: REDIRECT Disk density#TD * To a related topic: This is a redirect to an article about a similar topic or related term. Redirects from related topics are different than redirects from related words, because a related topic is more likely ... [70%] 2022-10-03
37. Bulk density: In materials science, bulk density, also called apparent density or volumetric density, is a property of powders, granules, and other "divided" solids, especially used in reference to mineral components (soil, gravel), chemical substances, pharmaceutical ingredients, foodstuff, or any other masses ... (Physics) [70%] 2023-12-16 [Density] [Soil physics]...
38. Charge density: The linear, surface, or volume charge density is the amount of electric charge in a line, surface, or volume. It is measured in coulombs per metre (C/m), square metre (C/m²), or cubic metre (C/m³), respectively. [70%] 2023-05-01 [Introductory physics] [Fundamental physics concepts]...
39. 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 density in the physics sense), although clinically it is measured by proxy ... (Physics) [70%] 2023-11-26 [Density] [Bones]...
40. Relative density: Template:Twwp-2 Relative density is a dimensionless ratio of the densities of two materials. The term specific gravity is similar, except that the reference material is water. (Physics) [70%] 2023-12-27 [Density]
41. Postsynaptic density: The postsynaptic density (PSD) is a protein dense specialization attached to the postsynaptic membrane. PSDs were originally identified by electron microscopy as an electron-dense region at the membrane of a postsynaptic neuron. (Biology) [70%] 2023-02-17 [Neurohistology]
42. Nutrient density: Nutrient density identifies the amount of beneficial nutrients in a food product in proportion to e.g. energy content, weight or amount of perceived detrimental nutrients. [70%] 2023-12-27 [Nutrition] [Dietetics]...
43. Orthobaric density: The orthobaric density of a compound is the density of coexisting phases (liquid, gas, or solid) at a given temperature. For any temperature below the critical point, the density of the gas will be less than that of the liquid. (Physics) [70%] 2023-09-11 [Density]
44. Maximum density: The maximum density of a substance is the highest attainable density of the substance under given conditions. Almost all known substances undergo thermal expansion in response to heating, meaning that a given mass of substance contracts to a low volume ... [70%] 2023-06-23 [Density] [Condensed matter physics]...
45. Electronic density: In quantum mechanics, and in particular quantum chemistry, the electronic density is a measure of the probability of an electron occupying an infinitesimal element of space surrounding any given point. It is a scalar quantity depending upon three spatial variables ... (Physics) [70%] 2023-12-22 [Atomic physics] [Quantum chemistry]...
46. Relative density: Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity for liquids is nearly always measured with respect to water at ... (Physics) [70%] 2022-08-01 [Density] [Physical quantities]...
47. Spectral density: The power spectrum \displaystyle{ S_{xx}(f) }[/math] of a time series \displaystyle{ x(t) }[/math] describes the distribution of power into frequency components composing that signal. According to Fourier analysis, any physical signal can be decomposed into a number ... (Physics) [70%] 2023-08-19 [Frequency-domain analysis] [Signal processing]...
48. Packing density: 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 terms, this is the ratio of the volume of bodies in a ... (Fraction of a space filled by objects packed into that space) [70%] 2023-12-23 [Packing problems] [Discrete geometry]...
49. Tensor density: pseudo-tensor A geometric object described in a coordinate system $ x = ( x ^ {1}, \dots, x ^ {n} ) $ by $ n ^ {p+q} $ components $ a _ {j _ {1} \dots j _ {q} } ^ {i _ {1} \dots i _ {p} } $, $ 1 \leq i ... (Mathematics) [70%] 2023-10-17