what is density?

Answer 1

D= mass divided by volume. The formal definition of density is mass per unit volume. Usually the density is expressed in grams per mL or cc

Answer 2

Go back through the chapter you are currently studying, it will give you that author's definition. But as per Webster's New World Dictionary:1. A dense condition 2. Stupidity 3. Number per unit, as of area [population density] 4. Ratio of mass of an object to its volume.

Answer 3

The higher an object's density, the higher its mass per volume. ... For other uses, see Density (disambiguation) ... The average density of an object equals ...
Quick Links: Other units - Measurement of density - Density of substances
en.wikipedia.org/wiki/Density - 29k - Cached - More from this site
Wikipedia: Population density
Population density is a measurement of population per unit area or unit volume. ... List of countries by population density. List of countries by population ...
Quick Links: Biological population densities - Human population density - Other methods of measuring population density
en.wikipedia.org/wiki/Population_density - 32k - Cached - More from this site
Density
Density ... containing the complete mass- volume- density module (including an online test ... This property of matter is called density. ...www.nyu.edu/pages/mathmol/textbook/density.html - 4k - Cached - More from this site
Density
Density Density This lesson introduces the concept of density, its measurement and the relationship to buoyancy.www.visionlearning.com/library/module_viewer.php?mid=37 - More from this site
Density
... 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 " ...www.elmhurst.edu/~chm/vchembook/120Adensity.html - 12k - Cached - More from this site
population density: Definition and Much More from Answers.com
population density ( ′päp·yə′lā·shən ′den·səd·ē ) ( ecology ) The size of the population within a particular unit of space ... by population density. List of ...www.answers.com/topic/population-density - 54k - Cached - More from this site
Gas Density
... property of any gas is its density. Density is defined as the mass of ... volume of material, one metal weighs less than another if it has a lower density. ...www.grc.nasa.gov/WWW/K-12/airplane/fluden.html -

Answer 4

Ahh !! HEHE i did a wholeee experiment on DENSITY !! i'd luv to help but i cant remember everything ..

U CAN SERACH IT ON YAHOO, GooGLE, MSN, Wikipedia .. (ithink u already did that lol )

OKK >> SOME THINGS :

http://en.wikipedia.org/wiki/Density

- Density is a measure of mass per volume.

- The quality or condition of being dense.

i cant remember !!

Answer 5

Density, amount of a substance contained within a specific area. 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. Density is often expressed in units such as grams per cubic centimeter (g/cm3) or pounds per cubic foot (lb/ft3).

The density of a substance can vary under different conditions. Substances expand and contract as their temperature changes, and as a result their density also changes. Precise measurements of density therefore include the temperature at which they were taken. For example, 1 cu cm of water at 4°C (39°F) weighs 1 g, so water’s density at that temperature is 1 g/cm3. Hot air balloons are able to fly because the density of air changes as its temperature changes. The balloon rises because the heated air inside its bag is less dense than the cooler air outside. Pressure also affects the density of gases. If a given amount of gas is contained within a smaller volume, its density increases. Air at sea level, for example, is denser than air at the top of Mount Everest because the air pressure at sea level is higher and squeezes the air into a smaller volume.

Scientists often indicate the density of a substance by using another measurement called specific gravity. Specific gravity is the density of a substance divided by the density of another substance that is used as a standard. For solids and liquids, water at 4°C (39°F) is usually the standard. Gold has a density of 19.3 g/cm3, so its specific gravity is 19.3 g/cm3 divided by 1 g/cm3 (the density of water at 4°C), or 19.3.

Density can be measured in a number of ways. Solid objects can be weighed to determine their mass and then immersed in a liquid to determine their volume. The volume of liquid displaced by the object is equal to the object’s volume, and the mass divided by the volume is its density. The density of a liquid may be determined similarly. The liquid’s mass can be found by first weighing an empty container, then weighing the container with the liquid in it, and then subtracting the empty weight from the full weight. The liquid’s volume may be determined by instruments similar to the transparent measuring cups used in cooking. Gases may be weighed in airtight containers of known volume and weight. Since gases are more sensitive to changes in temperature and pressure than are liquids or solids, the temperature and pressure must be included in any measurement of the density of a gas.

The term density is also used in many other ways. Population density, for example, is the number of people living within a certain area. Photographic density refers to the blackness of an image on film or on a photographic plate. Particle density is the number of particles in a given volume divided by that volume. Charge density is the total electric charge contained in a volume divided by that volume.