密度(みつど)は、広義には、対象とする何かの混み合いの程度を示す。ただし、科学において、単に密度といえば、単位体積あたりの質量である。より厳密には、ある量(物理量など)が、空間(3 次元)あるいは面上(2 次元)、線上(1 次元)に分布していたとして、これら空間、面、線の微小部分上に存在する当該量と、それぞれ対応する体積、面積、長さに対する比のことを(それぞれ、体積密度、面密度、線密度と言う)言う。微小部分は通常、単位体積、単位面積、単位長さ当たりに相当する場合が多い。勿論、4 次元以上の仮想的な場合でも、この関係は成立し、密度を定義することができる。その他の密度としては、状態密度、電荷密度、磁束密度、電流密度、数密度など様々な量(物理量)に対応する密度が存在する(あるいは定義できる)。物理量以外でも人口密度や確率密度、などの値が様々なところで用いられている。密度効果という語もある。

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  • A densidade (também massa volúmica ou massa volumétrica) de um corpo define-se como o quociente entre a massa e o volume desse corpo. Desta forma pode-se dizer que a densidade mede o grau de concentração de massa em determinado volume. O símbolo para a densidade é ρ (a letra grega ró) e a unidade SI para a densidade é quilogramas por metro cúbico (kg/m³).Densidade relativa é a relação entre a densidade da substância em causa e a massa volúmica da substância de referência (a água é geralmente tomada como referência). É uma grandeza adimensional, devido ao quociente. Quando se diz que um corpo tem uma densidade de 5, quer dizer que tem uma massa volúmica 5 vezes superior à da água (no caso dos sólidos e líquidos).Há uma pequena diferença entre densidade e massa específica. A massa específica, embora definida de forma análoga à densidade, contudo para um material e não um objeto, é propriedade de uma substância, e não de um objeto. Supõe-se pois que o material seja homogêneo e isotrópico ao longo de todo o volume considerado para o cálculo, e que este seja maciço. Um objeto oco pode ter densidade muito diferente da massa específica do material que os compõem, a exemplo os navios. Embora a massa específica do aço seja maior do que a massa específica da água, a densidade de um navio - assumido uma estrutura "fechada", é certamente menor do que a da água.Para líquidos e gases as expressões densidade e massa específica - dadas as propriedades físicas destes estados - acabam sendo utilizadas como sinônimos. A densidade ou mais especificamente a massa específica da água à pressão normal e à temperatura de 25 °C, é de 1,00 g/cm³, e a 4 °C, onde se atinge sua densidade máxima, é de 1,03 g/cm³ (a água apresenta dilatação anômala).O gelo ou, água no estado sólido, possui uma massa específica inferior àquela apresentada pela água em seu estado líquido (0,97 g/cm³), propriedade rara nos líquidos, que se explica pela polaridade da molécula da água e pelo aumento da distância média entre partículas. O mesmo ocorre geralmente com as substâncias que estabelecem pontes de hidrogênio, como os álcoois.
  • 密度(みつど)は、広義には、対象とする何かの混み合いの程度を示す。ただし、科学において、単に密度といえば、単位体積あたりの質量である。より厳密には、ある量(物理量など)が、空間(3 次元)あるいは面上(2 次元)、線上(1 次元)に分布していたとして、これら空間、面、線の微小部分上に存在する当該量と、それぞれ対応する体積、面積、長さに対する比のことを(それぞれ、体積密度、面密度、線密度と言う)言う。微小部分は通常、単位体積、単位面積、単位長さ当たりに相当する場合が多い。勿論、4 次元以上の仮想的な場合でも、この関係は成立し、密度を定義することができる。その他の密度としては、状態密度、電荷密度、磁束密度、電流密度、数密度など様々な量(物理量)に対応する密度が存在する(あるいは定義できる)。物理量以外でも人口密度や確率密度、などの値が様々なところで用いられている。密度効果という語もある。
  • Fisikan dentsitate terminoak bolumen jakin batean dagoen masa kopuruari dagokio eta termino erlatibo zein absolututan erabili daiteke. Horrela kalkulatzen da:Dentsitatea:masa/bolumenaDentsitate erlatiboak sustantzia baten masa eta ur bolumen beraren masaren arteko erlazioa finkatzen du, dimentsiorik gabeko magnitude bat delarik.Dentsitate absolutuak bolumen unitateko masa adierazten du. Hau izan ohi da dentsitate erabiltzen denean eman nahi den adiera.Sistema metriko hamartarrean, definizioz, uraren dentsitatea 1 da. Bere masa espezifikoa 1000 kg/m3-koa da, edo berdina dena, 1 kg/l-ko presioa atm 1 denean eta tenperatura 4°C.Dentsitatea lortzeko hainbat modu ezberdin daude. Objektu zurrunentzat zeinetan dentsitatea urarena baino handiagoa den, lehenengo bere masa balantza batean lortu eta ondoren bere bolumena. Bolumena kalkulatzeko uretan sar daiteke eta desplazatutako uraren kantitatea neurtu edo forma geometrikoa bada kalkulua modu zuzenean egin. Ondoren masa bolumenaz zaitzen da dentsitatea lortzeko.Likidoen dentsitatea neurtzeko dentsimetro bat erabili daiteke. Tutu itxi bat da bi aldeetatik zeinetan pisu bat dagoen alde batean eta kalibratuta dagoen. Likidoa sartu eta zuzenean neurtzen da. Horretarako likidoak 20 °Cko tenperatura izan behar du eta dentsimetroa ezin da mugitu irakurketa egiten den bitartean.
  • 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 (the lower case Greek letter rho). 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 (for instance, in the United States oil and gas industry), 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. Thus a relative density less than one means that the substance floats in water.The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. Increasing the temperature of a substance (with a few exceptions) decreases its density by increasing its volume. In most materials, heating the bottom of a fluid results in convection of the heat from the bottom to the top, due to the decrease in the density of the heated fluid. This causes it to rise relative to more dense unheated material.The reciprocal of the density of a substance is occasionally called its specific volume, a term sometimes used in thermodynamics. Density is an intensive property in that increasing the amount of a substance does not increase its density; rather it increases its mass.
  • Плътността на определена физична величина представлява стойността на тази величина в единица обем (обемна плътност), единица площ (повърхностна плътност) или единица дължина (линейна плътност). Измерителната единица зависи от съответната физична величина. Най-често, когато не е указано изрично друго, самостоятелният термин плътност се отнася за масовата обемна плътност на определено вещество или тяло.
  • Hustota představuje hodnotu dané veličiny vztažené k jednotkovému objemu (bývá také označována jako objemová hustota), jednotkovému obsahu plochy (pak se hovoří o plošné hustotě) nebo jednotkové délce (pak se hovoří o lineární hustotě).Používá se nejen ve fyzice (např. hustota hmotnosti, objemová hustota částic, hustota elektrického náboje apod.), ale také v jiných oborech vědy (viz např. hustota pravděpodobnosti, hustota zalidnění, optická hustota).Je-li uveden pojem hustota bez dalšího upřesnění, je tím téměř vždy myšlena měrná hmotnost.Stejný význam má veličina objemová hmotnost, zaváděná pro pórovité a sypké látky.
  • Homojen bir yapıya sahip maddenin birim hacminin kütlesi. Yoğunluk birimi gram/cm³ (gram/mililitre) veya kg/m³'tür. Yoğunluk, herhangi bir cismin hacminden kütlesinin veya kütlesinden hacminin hesaplanabilmesine imkân sağlar. Kütle hacimle yoğunluğun çarpımına, hacim ise kütlenin yoğunluğa bölümüne eşittir. İki tür yoğunluk vardır. Birincisi mutlak yoğunluktur ki, pratikte mutlak kelimesi kullanılmaz, sâdece yoğunluk denir. İkincisi ise izâfi yoğunluk (bağıl yoğunluk)tur. Fizik: Özkütle Kuantum fiziği: Olasılık yoğunluğu Toplumbilim ve demografi: Nüfus yoğunluğu İstatistik: Olasılık yoğunluk fonksiyonu İletişim: İletişim yoğunluğu, hat yoğunluğuyoğunluğun formülü yoğunluk=kütle/hacim'dir.
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rdfs:comment
  • 密度(みつど)は、広義には、対象とする何かの混み合いの程度を示す。ただし、科学において、単に密度といえば、単位体積あたりの質量である。より厳密には、ある量(物理量など)が、空間(3 次元)あるいは面上(2 次元)、線上(1 次元)に分布していたとして、これら空間、面、線の微小部分上に存在する当該量と、それぞれ対応する体積、面積、長さに対する比のことを(それぞれ、体積密度、面密度、線密度と言う)言う。微小部分は通常、単位体積、単位面積、単位長さ当たりに相当する場合が多い。勿論、4 次元以上の仮想的な場合でも、この関係は成立し、密度を定義することができる。その他の密度としては、状態密度、電荷密度、磁束密度、電流密度、数密度など様々な量(物理量)に対応する密度が存在する(あるいは定義できる)。物理量以外でも人口密度や確率密度、などの値が様々なところで用いられている。密度効果という語もある。
  • Плътността на определена физична величина представлява стойността на тази величина в единица обем (обемна плътност), единица площ (повърхностна плътност) или единица дължина (линейна плътност). Измерителната единица зависи от съответната физична величина. Най-често, когато не е указано изрично друго, самостоятелният термин плътност се отнася за масовата обемна плътност на определено вещество или тяло.
  • Fisikan dentsitate terminoak bolumen jakin batean dagoen masa kopuruari dagokio eta termino erlatibo zein absolututan erabili daiteke. Horrela kalkulatzen da:Dentsitatea:masa/bolumenaDentsitate erlatiboak sustantzia baten masa eta ur bolumen beraren masaren arteko erlazioa finkatzen du, dimentsiorik gabeko magnitude bat delarik.Dentsitate absolutuak bolumen unitateko masa adierazten du.
  • A densidade (também massa volúmica ou massa volumétrica) de um corpo define-se como o quociente entre a massa e o volume desse corpo. Desta forma pode-se dizer que a densidade mede o grau de concentração de massa em determinado volume.
  • Hustota představuje hodnotu dané veličiny vztažené k jednotkovému objemu (bývá také označována jako objemová hustota), jednotkovému obsahu plochy (pak se hovoří o plošné hustotě) nebo jednotkové délce (pak se hovoří o lineární hustotě).Používá se nejen ve fyzice (např. hustota hmotnosti, objemová hustota částic, hustota elektrického náboje apod.), ale také v jiných oborech vědy (viz např.
  • Homojen bir yapıya sahip maddenin birim hacminin kütlesi. Yoğunluk birimi gram/cm³ (gram/mililitre) veya kg/m³'tür. Yoğunluk, herhangi bir cismin hacminden kütlesinin veya kütlesinden hacminin hesaplanabilmesine imkân sağlar. Kütle hacimle yoğunluğun çarpımına, hacim ise kütlenin yoğunluğa bölümüne eşittir. İki tür yoğunluk vardır. Birincisi mutlak yoğunluktur ki, pratikte mutlak kelimesi kullanılmaz, sâdece yoğunluk denir. İkincisi ise izâfi yoğunluk (bağıl yoğunluk)tur.
  • 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 (the lower case Greek letter rho). Mathematically, density is defined as mass divided by volume:where ρ is the density, m is the mass, and V is the volume.
rdfs:label
  • Masse volumique
  • Densidad
  • Densidade
  • Densitat
  • Density
  • Densità
  • Dentsitate (fisika)
  • Dichte
  • Dichtheid (natuurkunde)
  • Gęstość
  • Hustota
  • Massa jenis
  • Sűrűség
  • Yoğunluk
  • Плотность
  • Плътност
  • 密度
  • 밀도
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