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Density is a measure of how much **mass** a substance has in comparison to its size. Density is defined as the ratio of mass to the **volume** of a particular substance. The mass of a material is directly proportional to the volume. If mass versus volume for a particular substance were plotted on a graph the result would be a straight line. The slope of this line would be the density of the substance. When calculating the density of a sample, the mass and the volume of the sample are determined and the mass of the sample is then divided by the volume. The *Système International d'Unités* (S.I.) unit for density measurements is kg/m^{3}, although it is often expressed in g/cm^{3} or g/mL.

Conceptually, density can be described as how close together the molecules in a substance are packed. Every...

This section contains 1,242 words(approx. 5 pages at 300 words per page) |