The ==Key Stage 3=====Meaning===[[Density]] is the amount of [[mass]] per [[unit]] [[volume]] of an [[object]]. ===About Density===: An [[object]] with a large amount of [[mass]] in a small [[volume]] is said to have a high [[density]].: An [[object]] with a small amount of [[mass]] spread over a large [[volume]] is said to have a low [[density]]. ===Density and Floating===: If an [[object]] is more '''dense''' than [[water]] it will sink.: If an [[object]] is less '''dense''' than [[water]] it will rise through [[water]] and float on the surface.