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Some things float while other things sink in liquids. Whether a body floats or sinks does not depend on size or volume, it depends on density.

A solid will float in a liquid if the solid is less dense than the liquid. It will sink if it is denser than the liquid.

Float or Sink - then calculate density - your own lab!

Why boats float and elephants sink?
Good explanation of flotation and buoyancy

Density column
Good illustration of density columns in a bottle and jar

Sinking Oranges
Good detail of preparation of oranges to experiment density followed by questions

Float or sink?
List of objects to float or sink with table to complete

Sink or float activity sheet

Sink or float assessment sheet

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