Density

=Density =

Stacie Freedman
 Definition: Density is used to characterized the amount of mass in a unit volume of a specific substance.

 Density= mass/volume Mass= density x volume Volume= mass/density

 Density is usually expressed in units of grams per cubic centimeter (g/cm3) or grams per milliliter (g/mL). Since most substances change volume when heated or cooled, density is closely related to temperature. Normally, when reporting densities temperature is also specified. If no temperature is specified, then it is understood to be at 25 C.

 When combining two liquids that do not mix, the less dense one will float on top of the more dense liquid. The liquid with the higher density is heavier per mL than the less dense liquid, so it "sinks" to the bottom.

http://www.stevespanglerscience.com/img/cache/bcb9b8db117ee64376aedaf7af3595ca/sevenlayer-2-51908.jpg This picture shows 7 layers of liquids "stacked" on top of each other based on the densities of the liquids. The yellow liquid is on the bottom because it is the most dense out of all the liquids. The clear liquid on top is the least dense so it is on the top. The rest of the liquids are layered based on their densities and the way they compare with the other liquids.

This table shows the densities of common substances at 25 C.
 * **Substance** || **Density (g/cm3)** ||
 * Water || 1.00 ||
 * Air || 0.001 ||
 * Table Salt || 2.16 ||
 * Whole Milk || 1.034 ||
 * Olive Oil || 0.915 ||