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Conversions - Linear Density

This site allows you to convert between a wide variety of Density units.

http://www.scenta.co.uk/tcaep/science/conversions/linear.htm

Conversions - Surface Density

This site allows you to convert between a wide variety of Density units.

http://www.scenta.co.uk/tcaep/science/conversions/surface.htm

Density

A good introduction to density, and its relationship to buoyancy.

http://www.visionlearning.com/library/module_viewer.php?mid=37

Density

Density is defined as mass per unit volume.

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

Density lab, multimedia activities

An applet where you measure the volume and mass of objects and then check if they float. You can alter the liquid's density too. Subscription required but with 30 day free trial.

http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=17

Conversions - Mass Density

This site allows you to convert between a wide variety of Mass and Density units.

http://www.scenta.co.uk/tcaep/science/conversions/density.htm

Balloon Race: Floating and Sinking

A nice little demonstration of the concept behind hot air balloons and densities.

http://www.pbs.org/wgbh/nova/balloon/science/density/

Poisson v4.0

Poisson calculates electrostatic potentials by numerically solving Poisson's equation in the presence of spherical and rectangular conductors, charge densities and dielectrics.