what is density?

Answer 1

ok, here's an answer that wasn't stolen from Wikipedia.

Density is the amount of mass per unit volume. Calculating density is as simple as it sounds, mass/volume.

Answer 2

Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. The higher an object's density, the higher its mass per volume. The average density of an object equals its total mass divided by its total volume. A denser object (such as iron) will have less volume than an equal mass of some less dense substance (such as water).

ρ=m/V

ρ is the object's density (measured in kilograms per cubic meter)
m is the object's total mass (measured in kilograms)
V is the object's total volume (measured in cubic meters)
Under specified conditions of temperature and pressure, the density of a fluid is defined as described above. However, the density of a solid material can be different, depending on exactly how it is defined. Take sand for example. If you gently fill a container with sand, and divide the mass of sand by the container volume you get a value termed loose bulk density. If you took this same container and tapped on it repeatedly, allowing the sand to settle and pack together, and then calculate the results, you get a value termed tapped or packed bulk density. Tapped bulk density is always greater than or equal to loose bulk density. In both types of bulk density, some of the volume is taken up by the spaces between the grains of sand.

Also, in terms of candy making, density is affected by the melting and cooling processes. Loose granular sugar, like sand, contains a lot of air and is not tightly packed, but when it has melted and starts to boil, the sugar loses its granularity and entrained air and becomes a fluid. When you mold it to make a smaller, compacted shape, the syrup tightens up and loses more air. As it cools, it contracts and gains moisture, making the already heavy candy even more dense.

A more theoretical definition is also available. Density can be calculated based on crystallographic information and molar mass:

Answer 3

It is a measure of compactness or closeness. The higher the density of something, the more compact that something is.

In general, rho = S/V is the equation for density of something (S) within a volume (V). We can also have rho = S/A; where A is an area rather than a volume. Or, we might have rho = S/t; where t is some period of time.

In general, density is a measure of something PER something. When you say "miles per hour," for example, you are reflecting a density...the number of miles packed into an hour's passage. We commonly call this "speed," but it is really a form of density.

While something per something is indeed density, the conventional understanding of density is usually in terms of mass or weight per unit volume. The mass density of air, for example, might have kg/m^3 (kilograms per cubic meter) as its units. Although something per unit area, like number of people per square mile, is also commonplace.

Answer 4

OK.......
density is the amount of matter in the unit of volume

BUT, mass is changable if there is a speed and volume too
Then think think think..........................................