(idea) by arfarf Sat Nov 13 1999 at 14:30:30
If you hold two objects with the same volume, the one that is heavier has the higher density.

Objects will float in liquids with a higher density. The volume of liquid they displace weighs more than the equal, displacing volume. Eureka!

del.icio.us Facebook Digg StumbleUpon Reddit (I like it!)