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# Topic: Density

###### In the News (Sun 22 Jul 18)

 Density Altitude Calculator - English Density altitude is defined as the altitude in the International Standard Atmosphere that has the same air density as the air being evaluated. The density of the air is reduced by decreased air pressure, increased temperatures and increased moisture. Relative density is the ratio of the actual air density to the standard sea level density, expressed as a percentage. www.wahiduddin.net /calc/calc_da.htm   (453 words)

 Density - MSN Encarta In physics, density is the ratio of the mass of a substance to its volume, and it can be calculated by dividing the mass by the volume. Specific gravity is the density of a substance divided by the density of another substance that is used as a standard. Particle density is the number of particles in a given volume divided by that volume. encarta.msn.com /encyclopedia_761567796/Density.html   (514 words)

 Density - Wikipedia, the free encyclopedia Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. Density in terms of the SI base units is expressed in terms of kilograms per cubic metre (kg·m A common device for measuring fluid density is a pycnometer. en.wikipedia.org /wiki/Density   (695 words)

 Density - LoveToKnow 1911 In the numerical expression of absolute densities it is necessary to specify the units of mass and volume employed; while in the case of relative densities, it is only necessary to specify the standard substance, since the result is a mere number. Related to the determination of the density of a gas is the determination of the density of a vapour, i.e. Its advantages rest on its high density and mobility; its main disadvantages are its liability to decomposition, the originally colourless liquid becoming dark owing to the separation of iodine, and its high coefficient of expansion. www.1911encyclopedia.org /Density   (4821 words)

 Density   (Site not responding. Last check: 2007-10-29) DENSITY is a physical property of matter, as each element and compound has a unique density associated with it. Density defined in a qualitative manner as the measure of the relative "heaviness" of objects with a constant volume. However the man may weigh: 150 lbs on earth, 25 lbs on the moon (because the force of gravity on the moon is 1/6 that of the earth), and be "weightless" in space. www.elmhurst.edu /~chm/vchembook/120Adensity.html   (532 words)

 Population density - Wikipedia, the free encyclopedia Population density is a measurement of population per unit area or unit volume. Cities with exceptionally high population densities are often considered to be overpopulated, though the extent to which this is the case depends on factors like quality of housing and infrastructure or access to resources. City population is however, heavily dependent on the definition used for the urban area: densities will be far higher for the central municipality than when more recently-developed and as yet administratively unincorporated suburbs are included, as in the concepts of agglomeration or metropolitan area, the latter including sometimes neighbouring cities. en.wikipedia.org /wiki/Population_density   (706 words)

 Gas Density For solids, the density of a single element or compound remains fairly constant because the molecules are bound to one another. Since density is defined to be the mass divided by the volume, density depends directly on the size of the container in which a fixed mass of gas is confined. Turning to the larger scale, the density is a state variable of a gas and the change in density during a process is governed by the laws of thermodynamics. www.grc.nasa.gov /WWW/K-12/airplane/fluden.html   (1004 words)

 Density Density relates the mass of a substance to its volume through the formula: D = M/V. From a density calculation, we may assess whether a substance will float or sink in any given medium and may also obtain a clue as to the identity of the substance. Because 1ml of water is equal to 1 cubic centimeter of water, the volume of the object is equal to the new volume in the graduated cylinder minus the original volume of water. The density formula may also be used to calculate the volume or the mass of an object, provided the other two variables in the equation are known. www.gmhsscience.com /problems/physdensity.html   (776 words)

 Density The weight density of a material is the weight of a given volume unit of the material divided by that volume unit. The relative density of a rock that is 2 times as dense as water is the density of the rock (124.8 pounds per cubic foot) divided by the density of water (62.4 pounds per cubic foot) to give 2.0. The relative density of steel is 7.7 and that of mercury is 13.6. www.grow.arizona.edu /water/waterscience/density.shtml   (353 words)

 Density Altitude   (Site not responding. Last check: 2007-10-29) In the U.S., such a density altitude is described as a "high density altitude." This can be confusing because you might assume that the word "high" modifies "density." That is, you might thank that the air has a high density as it does at low altitudes. The air's density is highest at low elevations when the pressure is high and the temperature is low, such as on a sunny but extremely cold, winter's day in Alaska. Density altitude is what makes it hard or even impossible for you to take your rather large brother-in-law flying in the middle of July when you had no problem at all lifting him off the ground back in March or April. www.geocities.com /pplans/ppcworld/density_altitude.htm   (1571 words)

 Harvard Gazette: What makes a city thrive? The forum was a follow-up to an earlier conference held by the BSA in September 2003. While most of those who attended the event viewed density as a cure for the city's ills, that attitude is by no means shared by all who take an interest in the welfare of America's towns and cities. Density is also considered good for the environment because it is easier and cheaper to provide heating, electricity, sewerage, and other services to people living in concentrated groups than to those in single-family homes in suburban areas. www.news.harvard.edu /gazette/2004/02.05/01-density.html   (1191 words)

 Density of Matter - School for Champions: Succeed in Physical Science The density of a quantity of matter is its mass divided by its volume. Density is related to how compressed the material is and the weight of its atoms or molecules per unit volume. Since density is related to the mass of an object, the density of a given volume of lead would be the same on both the Earth and the Moon, although the lead would weigh less on the Moon because of the lower gravity there. www.school-for-champions.com /science/density.htm   (1102 words)

 Information Internet: Chemistry, Density in   (Site not responding. Last check: 2007-10-29) Density (whose symbol is the lowercase letter d) is defined as mass per unit volume. Density is calculated by dividing the mass of an object by its volume. The density of a gas will be dealt with in a later unit, because its density is very sensitive to temperature and pressure. library.thinkquest.org /10679/chemistry/chem_dnty.html   (413 words)

 Density Altitude Calculator - English Density altitude is defined as the altitude in the International Standard Atmosphere that has the same air density as the air being evaluated. The density of the air is reduced by decreased air pressure, increased temperatures and increased moisture. Relative density is the ratio of the actual air density to the standard sea level density, expressed as a percentage. wahiduddin.net /calc/calc_da.htm   (453 words)

 Density meter. Different density measurement procdures.   (Site not responding. Last check: 2007-10-29) Density is defined as the mass per unit volume of a substance under fixed conditions. In industrial applications, the density of a substance is not always specified n units of kg/m3 or g/l or g/ml and the term specific gravity (SG) is used widely. Specific gravity (SG), also known as Relative density, is an abstract number expressing the ratio of the density of one substance to the density of another reference substance, both obtained at the same temperature and pressure. ph-scale.info /density.htm   (928 words)

 DENSITY Density is a physical property of matter- it is a descriptive characteristic of each type of material. The term in the denominator of the density equation decreases, causing the overall fraction to increase. Anyway, the density of a gas is a highly variable property, given the high compressibility of gases. academics.vmi.edu /chem_jt/CH131/density.htm   (2256 words)

 Areal Density The linear density of a disk is not constant over its entire surface--bear this in mind when reading density specifications, which usually list only the maximum density of the disk. The reason that density varies is because the lengths of the tracks increase as you move from the inside tracks to the outside tracks, so outer tracks can hold more data than inner ones. The reason is that the areal density of the disk impacts both of the key hard disk performance factors: both positioning speed and data transfer rate. www.storagereview.com /map/lm.cgi/areal_density   (1209 words)

 Density of Air Encyclopedia Article @ NaturalResearch.org (Natural Research)   (Site not responding. Last check: 2007-10-29) The density of air, ρ (Greek: rho) (air density), is the mass per unit volume of Earth's atmosphere, and is a useful value in aeronautics. Air density and air pressure decrease with increasing altitude. In this case, the density of the air is the sum of the density of the dry air and the density of the water vapor: www.naturalresearch.org /encyclopedia/Density_of_air   (297 words)

 USATODAY.com   (Site not responding. Last check: 2007-10-29) In addition to a basic discussion of air density, we will also describe the effects of lower air density – such as caused by going to high altitudes – on humans, how humidity affects air density – you might be surprised – and the affects of air density of aircraft, baseballs, and even racing cars. We see that the air's density is lowest at a high elevation on a hot day when the atmospheric pressure is low, say in Denver when a storm is moving in on a hot day. The air's density is highest at low elevations when the pressure is high and the temperature is low, such as on a sunny but extremely cold, winter's day in Alaska. www.usatoday.com /weather/wdensity.htm   (1445 words)

 R: Kernel Density Estimation the left and right-most points of the grid at which the density is to be estimated. This allows the estimated density to drop to approximately zero at the extremes. and the density estimate is of the sub-density on sekhon.berkeley.edu /library/stats/html/density.html   (510 words)

 Mammographic Density of mammograms, categories affecting risk Note: Radiologists are not required to describe the mammographic density in their reports. Many radiologists do not mention anything about mammographic density, unless the density is great enough to interfere with their ability to interpret the mammograms. Examples of 25% to 49% mammogram density, the most common situation in women over 50 yrs old. www.halls.md /breast/density.htm   (455 words)

 Density in Relation to Float and Sink   (Site not responding. Last check: 2007-10-29) After computing the density, students are to predict whether or not the objects will sink or float in regards to density. Knowing the densities of the given objects, students are to predict the density of the unknown solutions. Would the unknown solution's density be higher or lower than that of the density of a known object (wood, plastic, metal, rubber). www.iit.edu /~smile/ph9016.html   (472 words)

 Equations - Air Density and Density Altitude The density altitude is the altitude at which the density of the International Standard Atmosphere (ISA) is the same as the density of the air being evaluated. Density altitude is a concept based on solely on air density, and is neither "pressure altitude" nor "mean sea-level altitude", but is strictly "density altitude". Density altitude has been a convenient yardstick for pilots to compare the performance of aircraft at various altitudes, but it is in fact the air density that is the fundamentally important quantity, and density altitude is simply one way to express the air density. www.wahiduddin.net /calc/density_altitude.htm   (4207 words)

 Density Density (symbol: ρ - Greek: rho) (ISO 31: volumic mass) is a measure of mass per unit of volume. In the SI system of units, density is measured as kg/m = 1 kg/L. In Imperial units or U.S. customary unit, the unit of density is the pound/cubic foot. www.knowledgefun.com /book/d/de/density.html   (504 words)

 Activity: Density Density is defined as the average mass per unit volume; it is a measure of how much matter is squeezed into a given space. This activity focuses on techniques to determine densities of cubes, spheres, or rods of metal, rock, and ice. Use the metric ruler to measure the length, width, height, or diameter of the object. www.spacegrant.hawaii.edu /class_acts/Density.html   (304 words)

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