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Topic: Relative density

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In the News (Wed 19 Jun 19)

  Density - LoveToKnow 1911   (Site not responding. Last check: 2007-10-14)
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.
The standard substances employed to determine relative densities are: water for liquids and solids, and hydrogen or atmospheric air for gases; oxygen (as 16) is sometimes used in this last case.
The density gives very important information as to the molecular weight, since by the law of Avogadro it is seen that the relative density is the ratio of the molecular weights of the experimental and standard gases.
15.1911encyclopedia.org /Density   (4821 words)

Density defined in a qualitative manner as the measure of the relative "heaviness" of objects with a constant volume.
Density may also refer to how closely "packed" or "crowded" the material appears to be - again refer to the styrofoam vs. ceramic cup.
Density Comparison to Water: In chemistry, the density of many substances is compared to the density of water.
www.elmhurst.edu /~chm/vchembook/120Adensity.html   (532 words)

 Wikinfo | Density
Density (ISO 31: volumic mass) is a measure of mass per unit of volume.
Relative density, formerly called specific gravity, is a dimensionless quantity defined as the density of a substance divided by the density of water at standard temperature and pressure.
By definition, then, the relative density (or RD) of water is 1, and the RD of osmium is about 22.
www.wikinfo.org /wiki.php?title=density   (511 words)

 Density Simplified
Or the relative density of honey is 1.5.
Relative density is a little different from the other two types of measurement--viscosity and density.
Relative density is the measure of the density of something compared to the density of something else.
www.newton.dep.anl.gov /askasci/gen99/gen99428.htm   (1725 words)

The relative density of water is the density of water over the density of water, 62.4 pounds per cubic foot over 62.4 pounds per cubic foot, so that it is 1.0.
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 Measurements  Purpose
where d is the density of the sample, m is the mass of thee sample and v is the volume or amount of space occupied by the sample.
Density and floating: In general objects placed in a fluid that are less dense than the fluid float and objects that are more dense then the fluid sink.
The accepted value for the density of pure water is 1.00 g/mL and the density of ocean water at the surface is 1.03 g/mL.
science.csustan.edu /cstessman/density.htm   (849 words)

 Relative Humidity
The higher the temperature, the greater the maximum vapor density: at 0° C the density of water vapor at saturation is 5 g/m
Relative humidities of 0, 50%, and 100% mean respectively that no water vapor is present, that the air contains half as much moisture as the maximum possible, and that the air is saturated.
Relative humidity is water vapor density relative to saturation density.
www.sciencebyjones.com /relative_humidity.htm   (474 words)

 Lesson Plan - ChesBay Population Studies
Density is equated to a comparison of various areas such as an urban versus a rural environment.
The relative density of a species is expressed as a percentage of the total density.
The relative frequency of a species can be calculated by factoring the frequency of a particular species and comparing it to the frequency of all species.
www.baylink.org /lessons/pop_density.html   (987 words)

 Density meter. Different density measurement procdures.
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)

 Research Issues in San Diego Prehistory - Volume vs. Area Density
Intensity of use is a function of a number of variables of archaeological interest, including the length of the site's occupational history, the duration of the individual occupations, the size of the occupying groups, the compactness of their settlement, and the rate at which they produced artifact residues.
Estimation of total density and content based on volume also involves estimating of the mean depth of the deposit throughout the site, and a good estimate for this variable is frequently not available.
Future archaeological investigations may be able to test the relative effectiveness of volume and area density statistics for various interpretive objectives and the validity of the assumptions that underlie them.
home.earthlink.net /~researchissues/method.density.htm   (1023 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)

 Mass Density   (Site not responding. Last check: 2007-10-14)
Density is the concentration of matter It is the amount of mass per unit volume of a substance.
The relative density (Specific density) of a substance is a measure of how it compares in density to water.
The vapor density of a gas is a measure of how it compares to the density of hydrogen at a particular pressure and temperature.
home.earthlink.net /~tdp/massdensity.html   (245 words)

 Plant Community Analysis
Density is defined as the number of individuals of a species occupying an area.
We have calculated density for each vegetation layer separately, so there is a separate density for sugar maple trees, saplings, and seedlings.
Density tells us how many plants there are of a species in a unit of area but the values tell us nothing about how plants are distributed in the sampling area.
www.msu.edu /user/vieirast/commanlys.htm   (1817 words)

 community analysis
This is the density of a plant species as defined relative to the density of all plant species sampled.
Answer: Well, the low density tells us that there are very few individual plants per area, but the high frequency values mean that they are well dispersed in the habitat such that there is still a high probability that a randomly located plot would contain at least on individual of that plant.
Relative coverage is equivalent to saying the percentage of occupied space that is occupied by that particular plant species.
www.msu.edu /user/vieirast/comm.htm   (2251 words)

 Understandings of Consequence > Curriculum Modules > Density > Introduction > Challenges in Understanding Density
Many density units emphasize that density is a property of materials, related to different "material kinds." While this unit does introduce the idea that density is a property, it also alerts students and teachers to ways that this concept can be problematic for learners as they try to extend their understandings to more complex phenomena.
There are a number of reasons, from a cognitive and perceptual sense, that students would be inclined to focus on the weight of an object (and miss its density), or focus on the sinking or floating object (missing the role of the liquid), locating the cause of sinking or floating in the entity itself.
The impact on density due to atomic mass and to the strength and structure of atom and molecular bonds is outweighed by how spread out the atoms and molecules are due to pressure and temperature.
pzweb.harvard.edu /ucp/curriculum/density/i_challenges.htm   (2435 words)

 The MSDS HyperGlossary: Density
Relative density is essentially the same as specific gravity, however the temperature used for the water (or even another material) is not necessarily 4
C and it is being divided by the density of water at 0
The density or specific gravity can be handy if we know the mass of material that was shipped to us but we need to know the volume...or vice-versa.
www.ilpi.com /msds/ref/density.html   (865 words)

 Relative density - Wikipedia, the free encyclopedia
Relative density (also known as specific gravity) is a dimensionless ratio of the densities of two materials.
Determining the relative density of an object relative to water entails little effort, as the density of the object only needs to be divided by 1 or 1000, depending on the unit.
The specific gravity of liquids or solids is defined as the ratio of density of the material to the density of distilled water.
en.wikipedia.org /wiki/Relative_density   (1539 words)

 ASTM C 128 REV A Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine ...
This test method covers the determination of the average density of a quantity of fine aggregate particles (not including the volume of voids between the particles), the relative density (specific gravity), and the absorption of the fine aggregate.
Distinction is made between the density of aggregate particles as determined by this test method, and the bulk density of aggregates as determined by Test Method C 29/C 29M, which includes the volume of voids between the particles of aggregates.
The test results for density shall be reported in either SI units or inch-pound units, as appropriate for the use to be made of the results.
engineers.ihs.com /document/abstract/QUGRGBAAAAAAAAAA   (514 words)

 Relative Density
The relative density is the weight of a volume of a material divided by the weight of an equal volume of water.
The relative density is just the weight of the material in air divided by the difference in the weight in air minus that in water.
The table is also filled in to give the relative density from the measured weight values.
www.grow.arizona.edu /water/density/relativedensity.shtml   (303 words)

As the density is very much dependent on temperature, this temperature must be recorded and controlled very precisley.
Usually the density is measured at a reference temperature of 20°C. The density of water at 20° is:
A second unit used is the relative density (or specific gravity: S.G), where the measured density is divided by a reference value, the density of water at the same temperature.
www.cyberlaboratory.com /library/basicsofdensity/whatisdensity.htm   (256 words)

 Density   (Site not responding. Last check: 2007-10-14)
C, 1 ml of water weighs exactly 1 gram, the density of solutions are often quoted in g/ml.
Relative density (specific gravity) is the density relative to pure water.
If it seems a coincidence that water, at 1 ATM and at its most dense state, happens to have such a exact density is because it is what was used to define density units in the SI system
www.monashscientific.com.au /Density.htm   (106 words)

 Soil Testing, Density, Relative Density
Apparatus determines the relative density of cohesionless freedraining soils and provides well-defined results on soils that do not respond well to moisture-density impact compaction testing.
Relative density of cohesionless soils uses vibratory compaction to obtain maximum density and pouring to obtain minimum density.
Used for placement of loose 3/8” (9.5mm) or finer soils in relative density mold.
www.humboldtmfg.com /c-5-p-220-id-5.html   (177 words)

 Calculation of Importance Values
Relative frequency:  Number of occurrences of 1 species as a percentage of the total number of occurrences of all species.
Relative density:  Number of individuals of one species as a percentage of the total number of individuals of all species
Relative basal area:  Total basal area of one species as a percentage of the total basal area of all species.
www.ferrum.edu /caws/procedures/Imp_Value_Proc_Web.htm   (1192 words)

 species abundances
Relative abundance: The abundance of a species (by any measure), divided by the total abundance of all species combined.
The most commonly used importance value in forests is the sum of relative density, relative frequency, and relative dominance, each expressed as a percentage.
Since many studies do not include subsamples, IV is often calculated as the average of relative density and dominance.
www.okstate.edu /artsci/botany/ordinate/abund.htm   (735 words)

 Importance Values
Relative frequency: Frequency of a given species divided by the sum of the frequencies of all of the species * 100.
Relative density: Density of a given species divided by the sum of the densities of all of the species* 100.
Relative Dominance: Basal area of a given species divided by the sum of the basal areas of all of the species * 100.
www.sewanee.edu /Forestry_Geology/watershed_web/Imp_val.html   (1387 words)

Specific gravity is a unitless measure, because it is derived from the density of the mineral divided by the density of water and thus all units cancel.
However, since water's density equals 1 gram per cubic centimeter (at specific conditions), then a mineral's specific gravity would also correspond to a mineral's density as expressed in grams per cubic centimeter.
Specific gravity, or SG, as already stated compares the density of a mineral to the density of water.
mineral.galleries.com /minerals/property/density.htm   (595 words)

 Relative Aggregate Density
The Relative Aggregate Density may be entered on a Mix Design Form, provided aggregate details from the Laboratory Measurements Dialog are not being used in the mix design and the Relative Aggregate Density Known Check Box has been ticked.
A material’s relative density is defined as the ratio of the weight of a given volume of the material to the weight of the same volume of water.
A material’s absolute relative density is the ratio of the weight of the sum of the volumes of the particles of a given quantity of the material to the weight of an equal volume of water.
www.logicsphere.com /products/firstmix/hlp/html/aggr6338.htm   (228 words)

 Keywords density analyzer - Site Content Analyzer
Two thin bars in each line are relative (top bar) and absolute (bottom one) density of a word or file.
Absolute density is a ratio of number of words in the file to the total number of words in the project, while relative density is a ratio of number of words in the file to the number of words in the parent element.
For example, if some word occurs in the text of some file 5 times and this file has 100 words in total, while the whole project has 500, the relative density in this case will be 5 to 100 or 5% and the absolute density will be 5 to 500 or 1%.
www.sitecontentanalyzer.com /help/keyword-density-mode.html   (221 words)

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