Definition: The density of a material is the mass per unit volume.
The SI unit of density is kg/m2.
More from About.com
Browse Physics
"Density"
By Andrew Zimmerman Jones, About.com
Density - related terms
Density - related articles
What is Density?Density of Common SubstancesArchimedes of Syracuse
Must Reads
Essentials
Most Popular
What's Hot
©2008 About.com, a part of The New York Times Company.
All rights reserved.