Signification de "density" dans le dictionnaire anglais

La densité, ou plus précisément, la densité de masse volumétrique, d'une substance est sa masse par unité de volume. Le symbole le plus souvent utilisé pour la densité est ρ. Mathématiquement, la densité est définie comme une masse divisée par volume: où ρ est la densité, m est la masse et V est le volume. Dans certains cas, la densité est lâchement définie comme son poids par unité de volume, bien que cela soit scientifiquement imprécis - cette quantité est plus précisément appelée poids spécifique. Pour une substance pure, la densité a la même valeur numérique que sa concentration de masse. Différents matériaux ont généralement des densités différentes, et la densité peut être pertinente pour la flottabilité, la pureté et l'emballage. L'osmium et l'iridium sont les éléments connus les plus denses dans des conditions standard pour la température et la pression, mais certains composés chimiques peuvent être plus denses. Pour simplifier les comparaisons de densité dans différents systèmes d'unités, il est parfois remplacé par la quantité sans dimension "densité relative" ou "densité", c'est-à-dire le rapport de la densité du matériau à celui d'un matériau standard, habituellement de l'eau. The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ. Mathematically, density is defined as mass divided by volume: where ρ is the density, m is the mass, and V is the volume. In some cases, density is loosely defined as its weight per unit volume, although this is scientifically inaccurate – this quantity is more specifically called specific weight. For a pure substance the density has the same numerical value as its mass concentration. Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging. Osmium and iridium are the densest known elements at standard conditions for temperature and pressure but certain chemical compounds may be denser. To simplify comparisons of density across different systems of units, it is sometimes replaced by the dimensionless quantity "relative density" or "specific gravity", i.e. the ratio of the density of the material to that of a standard material, usually water.

synonymes en anglais de density

body · bulk · closeness · compactness · consistency · crassness · crowdedness · denseness · dullness · impenetrability · mass · obtuseness · slowness · solidity · stolidity · stupidity · thickness · tightness

👁 Tendances

Sur la carte précédente est reflétée la fréquence d'utilisation du terme «density» dans les différents pays.

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Liste des principales recherches réalisées par les utilisateurs pour accéder à notre dictionnaire anglais en ligne et des expressions les plus utilisées avec le mot «density».

Le graphique montre l'évolution annuelle de la fréquence d'utilisation du mot «density» durant les 500 dernières années. Son implémentation est basée sur l'analyse de la fréquence d'apparition du terme «density» sur les sources imprimées numériques anglaises publiées depuis l'année 1500 jusqu'aujourd'hui.

Anthony Albanese

Less cars on the road means productivity and jobs growth, as it allows for the more efficient movement of goods and services and encourages greater urban population density.

Sunni Brown

Under no circumstances should doodling be eradicated from a classroom or a boardroom or even the war room. On the contrary, doodling should be leveraged in precisely those situations where information density is very high and the need for processing that information is very high.

Anne Carson

There is something about the way that Greek poets, say Aeschylus, use metaphor that really attracts me. I don't think I can imitate it, but there's a density to it that I think I'm always trying to push towards in English.

Jason Epstein

By the mid 1970s, the great downtown bookstores had begun to disappear as their customers migrated from city to suburb where population density was too thin to support major backlist retailers.

Sally Field

But I was losing so much bone density that I would have been in grave danger. And I mean grave danger. If I had let it go just a few more years I could have broken my hip or spine just picking up my granddaughter.

Norman Foster

I hope that any expansion of London will learn from the planning examples of some of its most desirable areas such as Chelsea, Notting Hill, Belgravia and Mayfair. All are characterised by high density and a generosity of green spaces. They are all pedestrian-friendly with shops, entertainment, restaurants and pubs within easy walking distance.

Norman Foster

I hope that any expansion of London will learn from the planning examples of some of its most desirable areas such as Chelsea, Notting Hill, Belgravia and Mayfair. All are characterised by high density and a generosity of green spaces.

Andrea M. Ghez

We have this interesting problem with black holes. What is a black hole? It is a region of space where you have mass that's confined to zero volume, which means that the density is infinitely large, which means we have no way of describing, really, what a black hole is!

Robert Irwin

Whenever you look at light, basically it's just air. It has no tactileness to it. It's totally without density.

Don Kardong

The body responds to a calorie deficit by slowing down the metabolism and burning muscle tissue. That leads to weakness, sluggishness, slow times. In girls, it can also result in cessation of menstrual periods, which in turn leads to loss of bone density and frequent stress fractures.

1

Landscape architect and land planner Julie Campoli and aerial photographer Alex S. MacLean have joined forces to create a full-color, richly illustrated book to help planners, designers, public officials, and citizens better understand, and ...

2

This book is a rigorous, unified account of the fundamental principles of the density-functional theory of the electronic structure of matter and its applications to atoms and molecules.

3

Why is a small piece of metal heavier than a large piece of foam? Why does wood float in water? This books answers these questions as it teaches children about density in water and air.

4

Written in a clear pedagogic style, this book deals with the application of density matrix theory to atomic and molecular physics.

5

The account presented in this book places emphasis on topics of methodological importance, in the hope that this will facilitate broader practical application of density estimation and also encourage research into relevant theoretical work.

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Chapter exercises and answers are also included to reinforce the material presented, making this book an excellent learning/teaching resource.

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Written to convey an intuitive feel for both theory and practice, its main objective is to illustrate what a powerful tool density estimation can be when used not only with univariate and bivariate data but also in the higher dimensions of ...

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Four high-school friends--Meredith, Brandon, Greg, and Stephen--discover the fragile boundaries between friendship and betrayal as they are torn apart by passion, envy, dark secrets, and two violent deaths, as the casual cruelties of ...

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This is followed by the mean field theory of the phases transitions—discussed using second quantized formalism—together with the various experimental observations on the transition and on the ground states.

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This work offers a rigorous and detailed introduction to the foundations of this theory, up to and including such advanced topics as orbital-dependent functionals as well as both time-dependent and relativistic DFT.

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Low density SLC NAND flash memory market 2014 and forecast to …

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Multilayer magnetic recording to realize high-density hard disk drives

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