Each group needs:

• triple-beam balance or scale
• water
• tub for overflow water
• What Is the Density? Worksheet, one per group
• completed Triple-Entry Bones Vocabulary Worksheet (homework from the associated lesson), or the Triple-Entry Bones Vocabulary Worksheet Answer Key, one per group
• calculator

For the class to share:

• disarticulated human skeleton model of fabricated bones; see note below for two options
• graduated cylinders of various sizes to accommodate the various bone sizes; groups select one cylinder at a time, depending on the bone being measured
• rulers and meter sticks

Two options for fabricated bones, both available from Anatomy Warehouse:

1. One-half disarticulated budget skeleton anatomy model with skull, SKU# A-102704 for $82.25; see http://www.anatomywarehouse.com/one-half-disarticulated-budget-skeleton-anatomy-model-with-skull-a-102704
2. Axis Scientific complete disarticulated human skeleton, SKU# A-104406 for $210; see http://www.anatomywarehouse.com/axis-scientific-complete-disarticulated-human-skeleton-a-104406; this very detailed model has the bony landmarks seen on real bones, making it more realistic than the less-expensive option; it is also a full skeleton, and thus has more bones