Ironwood is a rare type of wood that has a density of 1.39 g/cc, which makes it sink it water. A great tool to demonstrate density or volume.
SIUE STEM Resource Center
http://www.siuestemcenter.org/
Southern Illinois University Edwardsvillehttp://www.siuestemcenter.org/
Science East, Room 1276
Edwardsville, IL, 62026
USA
618-650-3065