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The density of a material is defined as its mass per unit volume. The symbol of density is ρ (the Greek letter rho).

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Wikipedia About Density

The density of a material is defined as its mass per unit volume. The symbol of density is ρ (the Greek letter rho).

Formula

Mathematically:

\rho = \frac{m}{V} \,

where:

\rho is the density,
m is the mass,
V is the volume.

Different materials usually have different densities, so density is an important concept regarding buoyancy, metal purity and packaging.

In some cases density is expressed as the dimensionless quantities specific gravity (SG) or relative density (RD), in which case it is expressed in multiples of the density of some other standard material, usually water or air/gas.

History

In a well-known common story, Archimedes was given the task of determining whether King Hiero's goldsmith was embezzling gold during the manufacture of a wreath dedicated to the gods and replacing it with another, cheaper alloy.

Archimedes knew that the irregularly shaped wreath could be crushed into a cube whose volume could be calculated easily and compared with the weight; but the king did not approve of this.

Baffled, Archimedes took a relaxing bath and observed from the rise of the warm water upon entering that he could calculate the volume of the gold crown through the displacement of the water. Allegedly, upon this discovery, he went running naked through the streets shouting, "Eureka! Eureka!" (Greek "I found it"). As a result, the term "eureka" entered common parlance and is used today to indicate a moment of enlightenment.

This story first appeared in written form in Vitruvius' books of architecture, two centuries after it supposedly took place. Some scholars have doubted the accuracy of this tale, saying among other things that the method would have required precise measurements that would have been difficult to make at the time.

Measurement of density

For a homogeneous object, the mass divided by the volume gives the density. The mass is normally measured with an appropriate scale or balance; the volume may be measured directly (from the geometry of the object) or by the displacement of a fluid. Hydrostatic weighing is a method that combines these two.

If the body is not homogeneous or heterogeneous, the density is a function of the coordinates \rho(\vec{r})=dm/dv, where dv is elementary volume with coordinates \vec{r}. The mass of the body then can be expressed as

m = \int_V \rho(\vec{r})dv,

where the integration is over the volume of the body V.

A very common instrument for the direct measurement of the density of a liquid is the hydrometer, which measures the volume displaced by an object of known mass. A common laboratory device for measuring fluid density is a pycnometer; a related device for measuring the absolute density of a solid is a gas pycnometer. Another instrument used to determine the density of a liquid or a gas is the digital density meter - based on the oscillating U-tube principle.

Search results for Density

DENSITY

Density is a physical property of matter- it is a descriptive characteristic of ... First, let's consider density on the atomic level. ...academics.vmi.edu/chem_jt/CH131/density.htm

density: Definition, Synonyms from Answers.com

density n. , pl. -ties . The quality or condition of being dense. The quantity of something per unit measure, especially per unit length, area, orwww.answers.com/topic/density

Gas Density

An important property of any gas is its density. Density is defined as the mass of an object divided by its volume, and most of ...www.grc.nasa.gov/WWW/K-12/airplane/fluden.html

Density of Ice

DENSITY is defined in a qualitative manner as the measure of the relative " ... Usually the density is expressed in grams per mL or cc. ...www.elmhurst.edu/~chm/vchembook/122Adensityice.html

The MSDS HyperGlossary: Density

Entry in the Material Safety Data Sheet HyperGlossary at ILPI. ... Density and specific gravity have very similar, but not quite identical definitions. Density ...www.ilpi.com/msds/ref/density.html

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News about Density

TDK claims HDD recording density record

MacNNAt the CEATEC show kicking off today in Japan, TDK announced it has achieved a new milestone in surface recording density for hard disk drives thanks to its prototype TMR head. The company achieved the worldís highest surface recording density at 803GB/inch2, which could result in a typical single 1.8-inch double-sided disk having the capacity of 260GB. The TMR head is the same one as introduced ...http://www.macnn.com/articles/08/09/30/tdk.recording.hdd.den...

Utility tax measure causing a rift, while downtown housing measure floating by

Morgan Hill TimesAlong with a plethora of state propositions and county measures, Morgan Hill residents will decide on two city measures Nov. 4, one to raise taxes and one to raise high-density housing downtown.http://www.morganhilltimes.com/news/249064-utility-tax-measu...

Bones may weaken after weight loss surgery

Reuters via Yahoo! News Patients lose bone density after weight loss surgery, and the more weight they lose, the greater the drop, new research shows.http://news.yahoo.com/s/nm/20081001/hl_nm/us_bones_surgery_1

New subdivision approved

Whitsunday TimesLAND at Macarthur Drive and Grace Avenue in Cannonvale will be subdivided into 41 residential lots. Whitsunday Regional Council first refused the application almost three years ago after fears about density and flooding but the developer appealed the matter at the Planning and Environment Court.http://www.whitsundaytimes.com.au/storydisplay.cfm?storyid=3...

Community Calendar

York News-TimesFriday, October 3 • The University of Nebraska College of Nursing Cosmopolitan Mobile Nursing Unit will be in York at the Senior Center, 2325 Nebraska Avenue, 10 a.m. until noon on Friday, Oct. 3. Free screenings offered to people 60 and above are blood pressure, blood glucose, body mass index, cholesterol, peripheral glaucoma and bone density.http://www.yorknewstimes.com/news/x455209839/Community-Calen...

News about Density

A tenuous coexistence of fragility and density

ScoopOren Ambarchi is an experimental musician whose work explores the effect of music of tremulous beauty played at brutal volume. Born in Australia, he has a long history of challenging, absorbing solo work, and collaborations with some of the most ... http://www.scoop.co.nz/stories/CU0905/S00157.htm

Prince of Wales to address Britain's leading architects

Daily TelegraphThe Prince's strong interest in architecture led him to create his Poundbury village in Dorset, to break the mould of post-Second World War developments, mixing high-density social and private housing with work and leisure facilities. The ... http://www.telegraph.co.uk/news/newstopics/theroyalfamily/53...

Frost & Sullivan Recognizes Eaton Corporation for Market Penetration ...

EarthtimesIn April 2007 , Eaton acquired Aphel, a UK-based company recognized as an important supplier of high-density, fault-tolerant power distribution solutions for data centers, technical offices, laboratories and retail environments worldwide. In June of ... http://www.earthtimes.org/articles/show/frost--sullivan-reco...

Women's Health Center offers free check-ups

Hattiesburg AmericanScreens and tests include: glucose check, blood count, cholesterol check, HIV testing, blood pressure, body mass index, bone density scan and clinical breast exams. For more information on the event, call 544-4550 or visit www.semrhi.com . ... http://www.hattiesburgamerican.com/article/20090512/LIFESTYL...

Special committee fails to reach consensus on three-person rule

WTKRThe proposal calls for more on-campus housing at the university coupled with city zoning changes that would allow higher density residential development on or near campus. To that end, the university has already proposed a new 200-bed dorm and a mixed ... http://www.wtkr.com/news/dp-local_3person_0512may12,0,767572...

Search results for Density

density - Definition of density at YourDictionary.com

Preposition: of ionosphere: Six-day westward propagating wave in the maximum electron density of the ionosphere. Converse of object calculate: The number of working age ... http://www.yourdictionary.com/density

Density - LoveToKnow 1911

DENSITY (Lat. densus, thick), in physics, the mass or quantity of matter contained in unit volume of any substance: this is the absolute density; the term relative density or ... http://www.1911encyclopedia.org/Density

density: Definition, Synonyms from Answers.com

density n. , pl. -ties . The quality or condition of being dense. The quantity of something per unit measure, especially per unit length, area, orhttp://www.answers.com/topic/density

density - definition of density in the Medical dictionary - by the ...

density /den·si·ty/ (den´sit-e) 1. the quality of being compact or dense. 2. quantity per unit space, e.g., the mass of matter per unit volume.http://medical-dictionary.thefreedictionary.com/density

Density

New urbanism is the revival of our lost art of place-making, and promotes the creation and restoration of compact, walkable, mixed-use cities, towns, and neighborhoods.http://www.newurbanism.org/density.html

Wikipedia results for Density

Density - Wikipedia, the free encyclopedia

The density of a material is defined as its mass per unit volume. The symbol of density is ρ (the Greek letter rho).http://en.wikipedia.org/wiki/Density

Population density - Wikipedia, the free encyclopedia

Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, and ... http://en.wikipedia.org/wiki/Population_density

Density functional theory - Wikipedia, the free encyclopedia

Density functional theory (DFT) is a quantum mechanical theory used in physics and chemistry to investigate the electronic structure (principally the ground state) of many-body ... http://en.wikipedia.org/wiki/Density-functional_theory

Urban density - Wikipedia, the free encyclopedia

Urban density is a term used in urban planning and urban design to refer to the number of people inhabiting a given urbanized area. As such it is to be distinguished from other ... http://en.wikipedia.org/wiki/Urban_density

Electronic density - Wikipedia, the free encyclopedia

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 ... http://en.wikipedia.org/wiki/Electronic_density
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Answers for Density

dooneybaby131What is the average bone density of the cranial cavity?dooneybaby131The Cranial is made up of eight bones - I would suggest checking out each bones density - this link might help http://en.wikipedia.org/wiki/Cranial_cavity Good luck!!!ellieWhat is the average bone density for cats?ellieThere are no real numbers for bone density in animals that I am aware of. I once treated a kitten like this, seemed just accident prone. But once when we took xrays, we had another kitten of similar...Andrew ZHow do I find the density of sand particles in this question?Andrew ZWell, there are spaces between the sand particles ad the fluid occupies these spaces. If I were to use that assumption to calculate the density of sand particles, I'd have to say that the sand partic...caseybm07How do you determine the density of a solid?caseybm07As you say density is mass / volume You have a mass of 2.245g Volume is the difference in height of the water in the cylinder Vol = 7.2 -5 = 2.2 ml Density = 2.245 / 2.2 = 1.02045g/mlbeckyWhat is density in relation to the periodic table?beckyDensity is defined as the ratio of mass to volume. It is calculated using the formula, density= mass/volume. The density of atom is calculated by finding the ratio of the atomic mass (i.e Na, 23) w...
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