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The density of a material is defined as its mass per unit volume:

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Wikipedia About Density

The density of a material is defined as its mass per unit volume:

\rho = \frac{m}{V}

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 or relative density, in which case it is expressed in multiples of the density of some other standard material, usually water or air.

History

In a well-known 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 bath and observed from the rise of the water upon entering that he could calculate the volume of the crown through the displacement of the water. Allegedly, upon this discovery, he went running naked though 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.

If the body is inhomogeneous, 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.

The density of a solid material can be ambiguous, depending on exactly how its volume is defined, and this may cause confusion in measurement. A common example is sand: if gently filled into a container, the density will be low; when the same sand is compacted into the same container, it will occupy less volume and consequently exhibit a greater density. This is because sand, like all powders and granular solids contains a lot of air space in between individual grains; this overall density is called the bulk density, which differs significantly from the density of an individual grain of sand.

Search results for Density

DENSITY

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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

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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

Local Firefighters Off To Battle Santa Ana

KFSNIt's so much more populated in southern California the housing density is greater. There's a lot more homes in a tighter space than in central California," said Watkins. Already a handful of homes have been destroyed in Angeles National Forest North ... http://abclocal.go.com/kfsn/story?section=news/local&id=6443...

Soy foods aid bone density

Modesto BeeBone loss commonly occurs as we age, especially for women. Until recently, women were routinely prescribed estrogen after menopause to prevent bone loss and fractures. One alternative therapy is genistein, the plant hormone found primarily in soy ... http://www.modbee.com/life/yourhealth/story/453447.html

Proposals 3, 4 and 6

Herald TribuneBut some environmentally valuable lands, including many along the coasts, are zoned for high-density residential or commercial use. In such cases, the property appraiser is supposed to value those lands, for tax purposes, at their "highest and best ... http://www.heraldtribune.com/article/20081012/OPINION/810120...

Six steps to a green data center

Computerworld AustraliaCompare that figure to the 2,000 watts used in the same amount of space in 2002 -- energy use and heat density have more than doubled in five years! The increases do not appear to be slowing, and the increased heat requires increased cooling. And ... http://www.computerworld.com.au/index.php/id;786288979;fp;16...

Printed circuit connector modules combines high density with ...

Engineer LiveSMASH printed circuit connector for SEM Form E factor modules combines high density with reliability. With the SMASH connector range, Amphenol Socapex provides a highly reliable solution for SEM Form E factor modules. Its modular design provides up ... http://www.engineerlive.com/articles_electronicsEngineer/?/P...

Search results for Density

Density

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Density Dynamics Corporation

Density Dynamics Corporation ... Density Dynamics designs, manufactures, and sells high performance storage management and computing devices based on solid state memory.http://densitydynamics.com

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

Keyword Density Analyzer tool for search engine optimization and ...

Free, fast keyword density tool for search engine optimizers. Compare any two web pages on the internet.http://www.keyworddensity.com/
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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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