Many. For one, the Law of Archimedes, which says that a body submerged in a fluid is held afloat by a force equal to the mass of the fluid displaced by the body.
For another, Archimedes' spiral or Archimedes' screw. Ever seen an old kitchen meat mincer? The screw inside is Archimedes' screw. It was important in Archimedes' time for lifting water out of the sea/a river/a lake, as the screw, when enclosed in a relatively watertight housing, will lift water or other fluids up just by being "screwed in" into the water. (Such screws were, obviously, large, about man-sized.)
Misacek01 15:53, 12 June 2009 (UTC)