Mass

Newton's definition-quanity of matter

The amount of matter that makes up an object

http://www.merriam-webster.com/dictionary/mass?show=1&t=1321201216

http://hyperphysics.phy-astr.gsu.edu/hbase/mass.html

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

http://www.physics.ucla.edu/k-6connection/Mass,w,d.htm

http://www.merriam-webster.com/dictionary/mass?show=1&t=1321201216

http://www.ehow.com/how_2090536_teach-geometric-mass-kids.html


Interactive
http://www.sciencejoywagon.com/explrsci/media/density.htm

http://ippex.pppl.gov/interactive/